3588-12-3Relevant academic research and scientific papers
1,4-Dilithio-1,3-butadlenes
Ashe III, Arthur J.,Mahmoud, Samir
, p. 1878 - 1880 (2008/10/08)
On treatment with (trimethylstannyl)lithium in THF at -78°C, 1,4-dichlorobutadienes (4) gave the stereoisomeric 1,4-bis(trimethylstannyl)-1,3-butadienes (5-7). Compounds 5 and 7 may be converted to the corresponding 1,4-dilithio-1,3-butadienes (1 and 3) by treatment with excess methyllithium, while 6 and 7 may be converted to 1 by reaction with 1 equiv of methyllithium.
CHEMISTRY OF DIENES AND THEIR DERIVATIVES. XIX. DIRECTION OF THE LOW-TEMPERATURE CHLORINATION OF 1-CHLORO-1,3-BUTADIENE (α-CHLOROBUTADIENE) IN THE PRESENCE OF AN INHIBITOR OF RADICAL REACTIONS
Avagyan, S. P.,Airapetyan, R. Kh.,Kaplanyan, E. E.,Mkryan, G. M.
, p. 53 - 56 (2007/10/02)
During the low temperature (-20 to 0 deg C) chlorination of α-chlorobutadiene (94-95 deg C conversion) in the presence of tert-butylpyracatechol 1,1-, 1,2- and 1,4-dichloro-1,3-butadienes, 3,4,4- and 1,3,4-trichloro-1-butenes, 1,1,4-trichloro-2-butene, and the products from further chlorination of the 1,1- and 1,2-dichloro-1,3-butadienes (a mixture of 1,1,3,4- and 1,2,3,4-tetrachloro-1-butenes) are formed in ratios 1.6:0.5:21.8:6.5:50.2:13.7:5.7.Variation of the temperature in the investigated range does not have a significant effect on the ratios of the chlorination products.
Infrared multiphoton induced isomerization of cis-3,4-dichlorocyclobutene. I. Experimental results
Presser, Nathan,Mao, Chung-Rei,Moriarty, Robert M.,Gordon, Robert J.
, p. 6021 - 6029 (2007/10/02)
The yield and product distribution in the laser-induced isomerization of cis-3,4-dichlorocyclobutene (DCCB) have been measured as functions of laser fluence, DCCB pressure, and buffer gas pressure.Both Woodward-Hoffman allowed and "forbidden" isomers were observed.The fraction of "forbidden" products was found to increase linearly with fluence above a threshold of 3.5 J/cm2.At high fluence the yield increased quadratically with neat DCCB pressure.Both the yield and fraction of "forbidden" products declined monotonically with buffer gas pressure.These observations are explained in terms of a two-channel mechanism, in which the allowed isomer is formed in a concerted path and the forbidden isomers are produced from a diradical intermediate in a nonconcerted reaction.
