1,5-Cyclooctadiyne 1 was isolated in 2 percent yield from polymerized butatriene 5. Other oligomers of 5 were detected in the reaction mixture by combined GLC./MS. analysis but have not been identified. Diels-Alder adducts of 1 with two equivalents of 1,3-butadiene and of 2,3-dimethyl-1,3-butadiene have been prepared. In the presence of strong base 1 isomerized to cyclooctatetraene. 5 was reformed
Thiocyanato-butenes as inhibitors of microorganism growth
申请人:Imperial Chemical Industries PLC
公开号:US04962123A1
公开(公告)日:1990-10-09
A halogenated ethylene compound of the formula: X CR.sub.1 R.sub.2 C(Y.sub.1).dbd.C(Y.sub.2)CR.sub.1 R.sub.2 SCN where R.sub.1 and R.sub.2 are hydrogen, optionally substituted alkyl or together form a cyclohexyl group; X is bromine, chlorine or iodine and Y.sub.1 and Y.sub.2 are chlorine, bromine or iodine. A compound of this type is 2,3-dibromo-1-chloro-4-thiocyanato-2-butene. The compound has good anti-fungal and anti-bacterial properties. The compound can be used as an industrial biocide.
Cycloaddition Reactions of Cobalt-Complexed Macrocyclic Alkynes: The Transannular Pauson–Khand Reaction
作者:Sedef Karabiyikoglu、Byron A. Boon、Craig A. Merlic
DOI:10.1021/acs.joc.7b01369
日期:2017.8.4
ring-closing metathesis reactions followed by complexation with dicobalt octacarbonyl. Several reaction modalities of these macrocyclic complexes were uncovered. In addition to the first successful transannular Pauson–Khand reactions, other intermolecular and transannular cycloadditionreactions included intermolecular Pauson–Khand reactions, transannular [4 + 2] cycloadditionreactions, intermolecular [2
Ring-Closing Metathesis with Vicinal Dibromoalkenes as Protected Alkynes: A Synthetic Approach to Macrocyclic Enynes
作者:Sedef Karabiyikoglu、Robert G. Iafe、Craig A. Merlic
DOI:10.1021/acs.orglett.5b02595
日期:2015.11.6
A newstrategy to access macrocyclic enynes was developed. To block undesired ene–yne cyclization pathways, alkynes were protected via bromination and the resultant acyclic vic-(E)-dibromotrienes participated in selective ene–ene ring closing metathesis reactions. Zinc-promoted deprotection of (E)-dibromodienes provided macrocyclic enynes in high yields.