Abstract
A convenient method for the preparation of cyclobutenylidene complexes is presented. Photolysis of W(CO) 6 in CH 2Cl 2 gives (CO) 5W[CH 2Cl 2] ( 2). Substitution of coordinated CH 2Cl 2 in 2 by terminal alkynes, HCCR, gives thermolabile alkyne(pentacarbonyl)tungsten complexes (CO) 5W[HCCR] ( 3) [R Ph ( a), tBu ( b), c-Hex ( c), COOMe ( d), C(CH 2)Me ( e), CHC(OMe)H ( f)]. [2 + 2]-Cycloaddition of the CC bond of N,N-diethylaminoprop-1-yne to that of the coordinated terminal alkyne and subsequent tautomerization afford the cyclobutenylidene complexes ▪ ( 6). Analogously, the successive reactions of 2 with 1-ethynylcyclohexene and N,N-dimethylaminoprop-1-yne give ▪ ( 7). In addition to the compounds 6 and 7 the thermolabile complexes 3a and 3d could also be isolated. The structure of 3a has been established by an X-ray structure analysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
