Allylic Functionalization of Unactivated Olefins with Grignard Reagents
作者:Hongli Bao、Liela Bayeh、Uttam K. Tambar
DOI:10.1002/anie.201309134
日期:2014.2.3
the functionalization of unactivated olefins with carbonnucleophiles have provided moreefficient and practical approaches to convert inexpensive starting materials into valuable products. Recent examples have been reported with stabilized carbonnucleophiles, tethered carbonnucleophiles, diazoesters, and trifluoromethane donors. A general method for functionalizing olefins with aromatic, aliphatic
作者:John W. Huffman、Julia A.H. Lainton、Dong Dai、Robert D. Jordan、Sammy G. Duncan
DOI:10.1016/0024-3205(95)00184-8
日期:1995.5
The synthesis of (2'RS)-2'-methyl-, (3'RS)-, (3'S)-3'-methyl-, and 4'-methyl-delta 8-THC has been carried out, and the pharmacology of all four compounds has been investigated. All four compounds showed typical cannabinoid activity both in vitro and in vivo. The 2'-methyl compound is somewhat more active than delta 8-THC, while the 4'-methyl isomer is less active. The 3'-methyl-delta 8-THC has approximately
Novel chiral compounds of group 13 metals: the X-ray crystal structures of [((S)-2-methylbutyl)2MPtBu2]2 (M=Ga or In)
作者:M. Azad Malik、Stephen W. Haggata、Majid Motevalli、Paul O'Brien
DOI:10.1016/s0022-328x(96)06433-9
日期:1996.11
A series of novel chiral organometallic compounds has been synthesised and characterised by NMR, FT-IR and mass spectrometry. The X-ray crystalstructures of the dimeric compounds [(C5H11)2MPtBu2]2 (M=Ga, In;C5H11 = (S)-2-methylbutyl) are reported.
合成了一系列新颖的手性有机金属化合物,并通过NMR,FT-IR和质谱进行了表征。报告了二聚化合物[(C 5 H 11)2 MP t Bu 2 ] 2(M = Ga,In;C 5 H 11=(S)-2-甲基丁基)的X射线晶体结构。
Reversible Diastereoselective Photocyclization of a Diarylethene in a Single-Crystalline Phase
Optically active photochromic (S)- and (R)-1-(2-methyl-5-phenyl-3-thienyl)-2-[2-(3-methyl-1-penten-1-yl)-5-phenyl-3-thienyl]-3,3,3,4,5,5-hexafluorocyclopentanes ((S)-1a and (R)-1a) were synthesized. X-ray crystallographic measurement showed that (S)-1a and (R)-1a single crystals adopted orthorhombic chiral space group P2(1)2(1)2(1) and the open-ring isomers were packed in the crystals in only one conformer of the possible two atropisomers. Upon irradiation with 366 nm light (S)-1a and (R)-1a underwent reversible photocyclization reactions both in solution and in the single-crystalline state, and in the crystalline phase almost only one closed-ring diastereomer was produced, while the diastereoselection was not observed in solution. The dominant diastereomer produced from (S)-1a was determined to be (S,R,R)-1b by X-ray crystallographic analysis.