3588-11-2Relevant academic research and scientific papers
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 (1983)
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.
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.
