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Journal articles on the topic 'Cyclopropanes 1'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Craig, Alexander J., та Bill C. Hawkins. "The Bonding and Reactivity of α-Carbonyl Cyclopropanes". Synthesis 52, № 01 (2019): 27–39. http://dx.doi.org/10.1055/s-0039-1690695.

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The cyclopropane functionality has been exploited in a myriad of settings that range from total synthesis and methodological chemistry, to medical and materials science. While it has been seen in such a breadth of settings, the typical view of the cyclopropane moiety is that its reactivity is derived primarily from the release of ring strain. While this simplified view is a useful shorthand, it ignores the specific nature of cyclopropyl molecular orbitals. This review aims to present the different facets of cyclopropane bonding by examining the main models that have been used to explain the re

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2

Fadeev, Alexander A., Alexey O. Chagarovskiy, Anton S. Makarov, et al. "Synthesis of (Het)aryl 2-(2-hydroxyaryl)cyclopropyl Ketones." Molecules 25, no. 23 (2020): 5748. http://dx.doi.org/10.3390/molecules25235748.

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A simple general method for the synthesis of 1-acyl-2-(ortho-hydroxyaryl)cyclopropanes, which belong to the donor–acceptor cyclopropane family, has been developed. This method, based on the Corey–Chaykovsky cyclopropanation of 2-hydroxychalcones, allows for the preparation of a large diversity of hydroxy-substituted cyclopropanes, which can serve as promising building blocks for the synthesis of various bioactive compounds.

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3

Babu, Kaki Raveendra, Xin He, and Silong Xu. "Lewis Base Catalysis Based on Homoconjugate Addition: Rearrangement of Electron-Deficient Cyclopropanes and Their Derivatives." Synlett 31, no. 02 (2019): 117–24. http://dx.doi.org/10.1055/s-0039-1690753.

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Cyclopropane is one of the most reactive functionalities owing to its intrinsic ring strain. Transition-metal catalysis and Lewis acid catalysis have been extensively used in ring openings of cyclopropanes; however, Lewis base-catalyzed activation of cyclopropanes remains largely unexplored. Upon nucleophilic attack with Lewis bases, cyclopropanes undergo ring cleavage in a manner known as homoconjugate addition to form zwitterionic intermediates, which have significant potential for reaction development but have garnered little attention. Here, we present a brief overview of this area, with a

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4

Altamore, Timothy M., Oanh T. K. Nguyen, Quentin I. Churches, et al. "Concise Synthesis of Enantiomerically Pure (1'S,2'R)- and (1'R,2'S)-2S-Amino-3-(2'-aminomethyl-cyclopropyl)propionic Acid: Two E-Diastereoisomers of 4,5-Methano-L-lysine." Australian Journal of Chemistry 66, no. 9 (2013): 1105. http://dx.doi.org/10.1071/ch13309.

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A concise synthesis of both E-isomers of 2S-amino-3-(2′-aminomethyl-cyclopropyl)propionic acid, new methano-l-lysines, is described. The synthetic route includes nine steps from l-methionine, with a key step involving the cyclopropanation of an intermediate E-allylic alcohol. The resultant hydroxymethylcyclopropanes were readily separated and converted into the title α-amino acids. The stereochemistry around the cyclopropane rings was deduced by conducting the cyclopropanation in the presence of N,N,N′,N′-tetramethyl-d-tartaric acid diamide butylboronate, a chiral controller which is known to

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5

Song, Xixi, Junbiao Chang, Yuanyuan Zhu, Shuang Zhao, and Minli Zhang. "Diastereoselective Synthesis of Spirobarbiturate-Cyclopropanes through Organobase-Mediated Spirocyclopropanation of Barbiturate-Based Olefins with Benzyl Chlorides." Synthesis 51, no. 04 (2018): 899–906. http://dx.doi.org/10.1055/s-0037-1609637.

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The organobase-mediated diastereoselective spirocyclopropanation of barbiturate-based olefins with 2,4-disubstituted benzyl chlorides has been developed. The reactions were carried out efficiently to afford the desired spirobarbiturate-cyclopropanes in up to 95% yield with more than 20:1 dr in favor of anti-isomers. In order to extend synthetic utility of the spiro-products, a Lewis acid induced cyclopropane-ring-expansion isomerization was also demonstrated.

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6

Shi, Yongjia, Qian Gao, and Senmiao Xu. "Iridium-Catalyzed Asymmetric C–H Borylation Enabled by Chiral Bidentate Boryl Ligands." Synlett 30, no. 19 (2019): 2107–12. http://dx.doi.org/10.1055/s-0039-1690225.

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Asymmetric synthesis of optically pure organoboron compounds is a topic that has received a number of attentions owing to their particular importance in synthetic chemistry and drug discovery. We herein highlight recent advances in the iridium-catalyzed C–H borylation of diarylmethylamines and cyclopropanes enabled by chiral bidentate boryl ligands.1 Introduction2 Ir-Catalyzed Asymmetric C(sp2)–H Borylation of Diarylmethylamines3 Ir-Catalyzed Enantioselective C(sp3)–H Borylation of Cyclopropanes4 Conclusion

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7

Manna, Srimanta, and Andrey P. Antonchick. "[1+1+1] Cyclotrimerization for the Synthesis of Cyclopropanes." Angewandte Chemie 128, no. 17 (2016): 5376–79. http://dx.doi.org/10.1002/ange.201600807.

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8

Manna, Srimanta, and Andrey P. Antonchick. "[1+1+1] Cyclotrimerization for the Synthesis of Cyclopropanes." Angewandte Chemie International Edition 55, no. 17 (2016): 5290–93. http://dx.doi.org/10.1002/anie.201600807.

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9

Budynina, Ekaterina, Konstantin Ivanov, Ivan Sorokin, and Mikhail Melnikov. "Ring Opening of Donor–Acceptor Cyclopropanes with N-Nucleophiles." Synthesis 49, no. 14 (2017): 3035–68. http://dx.doi.org/10.1055/s-0036-1589021.

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Ring opening of donor–acceptor cyclopropanes with various N-nucleophiles provides a simple approach to 1,3-functionalized compounds that are useful building blocks in organic synthesis, especially in assembling various N-heterocycles, including natural products. In this review, ring-opening reactions of donor–acceptor cyclopropanes with amines, amides, hydrazines, N-heterocycles, nitriles, and the azide ion are summarized.1 Introduction2 Ring Opening with Amines3 Ring Opening with Amines Accompanied by Secondary Processes Involving the N-Center3.1 Reactions of Cyclopropane-1,1-diesters with Pr

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10

Jones, P. G., and G. Schrumpf. "Substituted cyclopropanes. 5. 1-Cyanocyclopropanecarboxylic acid." Acta Crystallographica Section C Crystal Structure Communications 43, no. 8 (1987): 1576–79. http://dx.doi.org/10.1107/s0108270187091029.

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11

Jones, P. G., and G. Schrumpf. "Substituted cyclopropanes. 1. trans-1,2,3-Tricyanocyclopropane." Acta Crystallographica Section C Crystal Structure Communications 43, no. 6 (1987): 1179–82. http://dx.doi.org/10.1107/s010827018709259x.

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12

Pohmakotr, Manat, and Srisamorn Sithikanchanakul. "Reaction of 1-Lithio (Phenylsulfinyl)-Cyclopropane with Electrophiles: An Alternative Synthesis of 1-Alkyl-and 1-(1-hydroxyalkyl)-(phenylsuslfinyl) Cyclopropanes." Synthetic Communications 19, no. 17 (1989): 3011–20. http://dx.doi.org/10.1080/00397918908052695.

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13

Ramnauth, Jailall, and Edward Lee-Ruff. "Photodecarbonylation of chiral cyclobutanones." Canadian Journal of Chemistry 75, no. 5 (1997): 518–22. http://dx.doi.org/10.1139/v97-060.

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Triplet photosensitized irradiation of 2(S),3(R)-bis[(benzoyloxy)methyl]cyclobutanone gave optically pure (−)E-1(S),2(S)-bis(benzoyloxymethyl)cyclopropane as a major product in the nonpolar fraction along with its stereoisomer and cycloelimination products. The absolute stereochemistry of the chiral cyclopropane was established by independent synthesis and X-ray crystal structure determination of a synthetic precursor. The distribution of decarbonylation and cycloelimination products was inversely dependent on the concentration of the substrate. Irradiation of the same ketone in tetrahydrofura

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14

Gazzaeva, R. A., S. S. Mochalov, B. P. Archegov, and N. S. Zefirov. "Isoxazolines from Benzyl Cyclopropanes." Chemistry of Heterocyclic Compounds 41, no. 2 (2005): 272. http://dx.doi.org/10.1007/s10593-005-0144-1.

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15

Ramnauth, Jailall, and Edward Lee-Ruff. "Photochemical preparation of cyclopropanes from cyclobutanones." Canadian Journal of Chemistry 79, no. 2 (2001): 114–20. http://dx.doi.org/10.1139/v00-175.

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A general method for the preparation of cyclopropanes is reported. Triplet-photosensitized reactions of a series of cyclobutanones give cyclopropanes as the major product. Part 1 describes the synthesis of substituted cyclobutanones used in this study. In Part 2, the photo-reactions of cyclobutanones are reported. Triplet-sensitized reactions of cyclobutanones using acetone as a sensitizer give cyclopropanes as the major non-polar products. The extent of photodecarbonylation seems to be dependent on α-substitution. Electron-donating groups promote decarbonylation while electron-withdrawing gro

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16

Herraiz, Ana G., and Marcos G. Suero. "New Alkene Cyclopropanation Reactions Enabled by Photoredox Catalysis via Radical Carbenoids." Synthesis 51, no. 14 (2019): 2821–28. http://dx.doi.org/10.1055/s-0037-1611872.

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We describe the recent emergence of a new approach for the synthesis of cyclopropane rings by means of photoredox catalysis. This methodology relies on the photocatalytic generation of radical carbenoids or carbenoid-like radicals as cyclopropanating species, and is characterized by excellent functional group tolerance, chemoselectivity and the ability to form cyclopropanes with excellent control from E/Z alkene mixtures. The mild reaction conditions and employment of user-friendly reagents are highly attractive features that may lead to this approach being used in academic and industrial labo

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17

Bhupathy, M., and Theodore Cohen. "1-Phenylthio-1-(trimethylsiloxy)cyclopropanes via the sila-Pummerer rearrangement." Tetrahedron Letters 28, no. 41 (1987): 4793–96. http://dx.doi.org/10.1016/s0040-4039(00)96627-9.

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18

Cunico, Robert F. "Thermolytic behavior of some 1-oxa-substituted 1-(trimethylsilyl)cyclopropanes." Organometallics 4, no. 12 (1985): 2176–79. http://dx.doi.org/10.1021/om00131a020.

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19

Wanapun, D., K. A. Van Gorp, N. J. Mosey, M. A. Kerr, and T. K. Woo. "The mechanism of 1,3-dipolar cycloaddition reactions of cyclopropanes and nitrones A theoretical study." Canadian Journal of Chemistry 83, no. 10 (2005): 1752–67. http://dx.doi.org/10.1139/v05-182.

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The 1,3-dipolar cycloaddition reaction of cyclopropanes and nitrones to give tetrahydro-1,2-oxazine has been studied with density functional theory calculations at the B3LYP/6-31+G(d,p) level of theory. Realistic substituents were modelled including those at the 2-, 3-, 4-, and 6-positions of the final oxazine ring product. The strained σ bond of the cyclopropane was found to play the role of an alkene in a conventional [3+2] dipolar cycloaddition. Two distinct, but similar, reaction mechanisms were found an asymmetric concerted pathway and a stepwise zwitterionic pathway. The reaction barri

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20

Zhou, Qing, Bo Chen, Xiao-Bing Huang, et al. "Palladium-catalyzed diastereo- and enantioselective formal [3 + 2] cycloaddition of vinyl cyclopropanes with cyclic 1-azadienes." Organic Chemistry Frontiers 6, no. 11 (2019): 1891–94. http://dx.doi.org/10.1039/c9qo00325h.

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21

Minnaard, A., B. Feringa, T. Hartog, A. Rudolph, and B. Maciá. "Enantioselective Synthesis oftrans-1-Alkyl-2-Substituted Cyclopropanes." Synfacts 2011, no. 01 (2010): 0057. http://dx.doi.org/10.1055/s-0030-1259163.

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22

Cermola, Flavio, Lucrezia Di Gioia, Maria Liliana Graziano, and Maria Rosaria Iesce. "Ring-opening reactions of cyclopropanes. Part 8.1 Nitrosation of donor–acceptor cyclopropanes." Journal of Chemical Research 2005, no. 10 (2005): 677–81. http://dx.doi.org/10.3184/030823405774663039.

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The reaction of 2,2-dialkoxycyclopropane-1-carboxylates 1a–d and monoalkoxycyclopropane 1e with NOCl gives isoxazoline- and/or isoxazole-3-carboxylates by regioselective ring-opening at C1–C2 bond. A mechanistic interpretation suggests the intermediacy of well-stabilised dipolar species.

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23

Bhupathy, M., and Theodore Cohen. "1-Methoxy-1-(phenylthio)cyclopropanes from olefins via the Pummerer rearrangement." Tetrahedron Letters 28, no. 41 (1987): 4797–800. http://dx.doi.org/10.1016/s0040-4039(00)96628-0.

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24

Warner, Philip M., Robert D. Herold, I. Shan Chu, and Jeffrey Lessman. "Mechanism of the thermal decomposition of 1-bromo-1-(trimethylstannyl)cyclopropanes." Journal of Organic Chemistry 53, no. 5 (1988): 942–50. http://dx.doi.org/10.1021/jo00240a003.

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25

Nishikata, Takashi, Yushi Noda, Ryo Fujimoto, and Shingo Ishikawa. "A facile formal [2+1] cycloaddition of styrenes with alpha-bromocarbonyls catalyzed by copper: efficient synthesis of donor–acceptor cyclopropanes." Chemical Communications 51, no. 64 (2015): 12843–46. http://dx.doi.org/10.1039/c5cc04697a.

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26

Liu, Ren-Rong, Shi-Chun Ye, Chuan-Jun Lu, Bin Xiang, Jianrong Gao, and Yi-Xia Jia. "Au-catalyzed ring-opening reactions of 2-(1-alkynyl-cyclopropyl)pyridines with nucleophiles." Organic & Biomolecular Chemistry 13, no. 17 (2015): 4855–58. http://dx.doi.org/10.1039/c5ob00523j.

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A novel method for the C–C bond cleavage of cyclopropanes was developed by gold-catalyzed cycloisomerization of 2-(1-alkynyl-cyclopropyl)pyridine with nucleophiles, which provides efficient access to structurally diverse indolizines under mild conditions.

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27

Wang, Zhe-Hao, Huan-Huan Zhang, Dao-Ming Wang, Peng-Fei Xu, and Yong-Chun Luo. "Lewis acid catalyzed diastereoselective [3+4]-annulation of donor–acceptor cyclopropanes with anthranils: synthesis of tetrahydro-1-benzazepine derivatives." Chemical Communications 53, no. 61 (2017): 8521–24. http://dx.doi.org/10.1039/c7cc04239f.

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28

Li, Qing-Zhu, Xiang Zhang, Ke Xie, et al. "Diastereodivergent synthesis of cyclopropanes via on-water [2 + 1] annulations of diazo compounds with electron-deficient alkenes." Green Chemistry 21, no. 9 (2019): 2375–79. http://dx.doi.org/10.1039/c9gc00278b.

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An efficient on-water [2 + 1] annulation of diazo compounds and electron-deficient alkenes under catalyst-free conditions was developed, which allows the synthesis of cyclopropanes in a diastereodivergent manner.

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29

Tomilov, Yu V., E. V. Shulishov, S. A. Yarygin, and O. M. Nefedov. "Thermal decomposition of strained spiro(1-pyrazoline-3,1?-cyclopropanes)." Russian Chemical Bulletin 44, no. 11 (1995): 2109–13. http://dx.doi.org/10.1007/bf00696714.

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30

Su, Zhenjie, Siran Qian, Shuwen Xue, and Cunde Wang. "DBU-mediated [4 + 1] annulations of donor–acceptor cyclopropanes with carbon disulfide or thiourea for synthesis of 2-aminothiophene-3-carboxylates." Organic & Biomolecular Chemistry 15, no. 37 (2017): 7878–86. http://dx.doi.org/10.1039/c7ob01886j.

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31

Silveira, Claudio C., Antonio L. Braga, and Gustavo L. Fiorin. "Arylseleno and 1-Chloro-1-arylseleno Cyclopropanes from P.T.C. and Ultrasound Conditions." Synthetic Communications 24, no. 14 (1994): 2075–80. http://dx.doi.org/10.1080/00397919408010218.

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32

Díaz, E., R. A. Toscano, A. Alvarez, J. N. Shoolery та K. Jankowski. "1,1-Dichlorocyclopropane derivatives of α and β ionones. Structure determination of 3R,3′S-bis[3-methyl-5-(1′,3′,3′-trimethylcyclohex-1′-en-2′-yl)-2(1H)-furanone]". Canadian Journal of Chemistry 68, № 5 (1990): 701–4. http://dx.doi.org/10.1139/v90-108.

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1,1-Dihalocyclopropane derivatives and furanones were synthesized from ±α- and β-ionones using CHCl3, NaOH, and triethylbenzyl ammonium chloride (TEBAC). 2D NMR and single-crystal X-ray analyses of the products are reported. Keywords: addition of 1,1-dihalocarbenes to ionones, phase transfer addition of 1,1-dihalo systems, formation of cyclopropanes.

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33

Verma, Kamal, Irshad Maajid Taily, and Prabal Banerjee. "Exploitation of donor–acceptor cyclopropanes and N-sulfonyl 1-azadienes towards the synthesis of spiro-cyclopentane benzofuran derivatives." Organic & Biomolecular Chemistry 17, no. 35 (2019): 8149–52. http://dx.doi.org/10.1039/c9ob01369e.

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An efficient method for the synthesis of spiro-cyclopentane benzofuran derivatives via a MgI<sub>2</sub>-catalyzed formal [3 + 2] cycloaddition reaction between donor–acceptor cyclopropanes and N-sulfonyl 1-azadienes in good yield has been developed.

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34

Krief, Alain, and François Couty. "Synthesis of 1-Aryl-2-Vinyl Cyclopropanes by Intramolecular Carbolithiation." Tetrahedron Letters 38, no. 46 (1997): 8085–88. http://dx.doi.org/10.1016/s0040-4039(97)10115-0.

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35

Zhao, Ligang, Baris Yucel, René Peter Scheurich, Daniel Frank, and Armin de Meijere. "Diels–Alder Reactions of Novel (1′-Arylallylidene)cyclopropanes with Heterodienophiles." Chemistry – An Asian Journal 2, no. 2 (2007): 273–83. http://dx.doi.org/10.1002/asia.200600361.

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36

Mora, A. J., A. V. Rivera, E. Rodulfo de Gil, M. E. Alonso, and S. Pékerar. "Phenyl-substituted cyclopropanes. II. Ethyl trans-2-phenylcyclopropane-1-carboxylate." Acta Crystallographica Section C Crystal Structure Communications 47, no. 6 (1991): 1234–36. http://dx.doi.org/10.1107/s0108270190010587.

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37

Muray, Elena, Ona Illa, José A. Castillo, et al. "Photolysis of Chiral 1-Pyrazolines to Cyclopropanes: Mechanism and Stereospecificity." Journal of Organic Chemistry 68, no. 12 (2003): 4906–11. http://dx.doi.org/10.1021/jo0342471.

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38

Guliev, K. G., G. Z. Ponomareva, S. B. Mamedli, and A. M. Guliev. "Ultraviolet absorption spectra of 2-substituted-1-(p-vinylphenyl)cyclopropanes." Journal of Structural Chemistry 50, no. 4 (2009): 693–95. http://dx.doi.org/10.1007/s10947-009-0105-0.

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39

Yamabe, Shinichi, Noriko Tsuchida, Tsutomu Minato, and Takahisa Machiguchi. "Symmetry or asymmetry in cheletropic additions forming cyclopropanes." Theoretical Chemistry Accounts 113, no. 2 (2005): 95–106. http://dx.doi.org/10.1007/s00214-004-0612-1.

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40

Wu, Shuai, Jun-Fang Li, Xiu-Li Sun, Xiao-Yan Wang, and Yong Tang. "Synthesis of novel polyethers with abundant reactive sites and diverse skeletons based on the ring-opening reaction of D–A cyclopropanes." Polymer Chemistry 11, no. 37 (2020): 5969–73. http://dx.doi.org/10.1039/d0py01095b.

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41

Khalil, Salim M. "A DFT Study on the Stepwise Fluorinated Methylenecyclopropane ⇋ 1-Methylcyclopropene System." Zeitschrift für Naturforschung A 63, no. 1-2 (2008): 42–48. http://dx.doi.org/10.1515/zna-2008-1-207.

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Density functional theory (DFT) calculations have been performed to calculate the optimized geometries of stepwise fluorinated methylenecyclopropanes and 1-methylcyclopropenes. Increasing the number of fluorine atoms caused a destabilization of methylenecycopropane. Perfluorinated 1-methylcyclopropene was found to be present in substantial concentration. This is supported by calculations of the Gibbs free energy, isodesmic reactions and orbital energies (HOMO-LUMO). These results are compared with the fluorinated cyclopropanes keto-enol system. Enthalpies, entropies and dipole moments are repo

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42

Ramazanov, Ilfir, Alsu Yaroslavova, Niyaz Yaubasarov, and Usein Dzhemilev. "Allyl and 2-Cyclopropylethyl Rearrangements in the Reaction of 1-Alkenylaluminums with Diiodomethane/Triethylaluminum Reagent." Synlett 29, no. 05 (2017): 627–29. http://dx.doi.org/10.1055/s-0036-1591731.

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The reaction of diiodomethane and triethylaluminum with substituted 1-alkenylaluminums obtained by the Zr-catalyzed carbo- or cycloalumination of mono- or dialkyl-substituted alkynes resulted in the selective formation of di- and tetrasubstituted cyclopropanes. 1-Alkenylaluminums prepared from substituted propargylamines reacted with diiodomethane and triethylaluminum to give substituted allylamines. A plausible mechanism for the reaction of the 1-alkenylaluminums with diiodomethane/triethylaluminum is proposed.

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43

Carreras, Javier, Ana Caballero, and Pedro J. Pérez. "Enantio- and Diastereoselective Cyclopropanation of 1-Alkenylboronates: Synthesis of 1-Boryl-2,3-Disubstituted Cyclopropanes." Angewandte Chemie International Edition 57, no. 9 (2018): 2334–38. http://dx.doi.org/10.1002/anie.201710415.

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44

Carreras, Javier, Ana Caballero, and Pedro J. Pérez. "Enantio- and Diastereoselective Cyclopropanation of 1-Alkenylboronates: Synthesis of 1-Boryl-2,3-Disubstituted Cyclopropanes." Angewandte Chemie 130, no. 9 (2018): 2358–62. http://dx.doi.org/10.1002/ange.201710415.

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45

Bets, L., Z. Ribkovskaia, L. Vlad, S. Pogrebnoi, F. Galin, and F. Macaev. "Optically Active Chrysanthemic Acid and its Analogues." Chemistry Journal of Moldova 5, no. 1 (2010): 57–72. http://dx.doi.org/10.19261/cjm.2010.05(1).04.

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Optically active chrysanthemic acid and its analogues have received considerable attention in recent years due to their practical importance. This review will focus on describing the developments in the synthesis of optically active chrysanthemic acid and its analogues. The transformation that will be covered includes the chemistry of enantiomerically pure 2,2-dimethyl 1,3-disubstituted cyclopropanes derived from monoterpene (+)-3-carene.

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46

Brandau, Sven, and Dieter Hoppe. "Asymmetric synthesis of (2-carbamoyloxy-1-alkenyl)cyclopropanes by intramolecular cycloalkylation." Tetrahedron 61, no. 52 (2005): 12244–55. http://dx.doi.org/10.1016/j.tet.2005.09.110.

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47

Dulin, Callie C., Kristen L. Murphy, and Kristine A. Nolin. "Calcium-catalyzed Friedel–Crafts addition of 1-methylindole to activated cyclopropanes." Tetrahedron Letters 55, no. 38 (2014): 5280–82. http://dx.doi.org/10.1016/j.tetlet.2014.07.108.

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48

Schrumpf, G., and H. Dunker. "Vibrational spectra of cyanosubstituted cyclopropanes—III. Cyanocyclopropane and cyanocyclopropane-1-d1." Spectrochimica Acta Part A: Molecular Spectroscopy 42, no. 7 (1986): 785–91. http://dx.doi.org/10.1016/0584-8539(86)80105-2.

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49

Jonczyk, Andrzej, and Irena Kmiotek-Skarzynska. "Reactions of organic anions. 159. A new reaction of 1-bromo-2-(chloromethyl)cyclopropane in basic medium: a simple preparation of 1-(alkoxymethylene)cyclopropanes." Journal of Organic Chemistry 54, no. 11 (1989): 2756–59. http://dx.doi.org/10.1021/jo00272a058.

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50

Harada, Toshiro, Takeshi Katsuhira, Kazuhiro Hattori, and Akira Oku. "Stereoselective synthesis of gem-disubstituted cyclopropanes from gem-dibromocyclopropanes." Tetrahedron Letters 30, no. 44 (1989): 6039–40. http://dx.doi.org/10.1016/s0040-4039(01)93848-1.

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