Details
| Original language | English |
|---|---|
| Pages (from-to) | 2108-2113 |
| Number of pages | 6 |
| Journal | Organometallics |
| Volume | 19 |
| Issue number | 11 |
| Publication status | Published - 28 Apr 2000 |
Abstract
Reactions of cyclopropenone derivatives with the [2-(di-tert-butylphosphanyl)ethyl]cyclopentadienylcobalt(I) chelate system were investigated. Ethene complex 2 reacts with diphenylcyclopropenone under cobalt insertion to give cobaltacyclobutenone chelate complex 6 in 91% yield. 6 was characterized crystallographically and shows a structure similar to that of a known platinacyclobutenone. Thermoanalysis of 6 indicated a reaction at elevated temperature, which was shown to be a cycloreversion at 60°C leading to known diphenylethyne and carbonyl complexes 7 and 9. Attempts to reduce the metallacyclobutenone with lithium tetrahydridoaluminate resulted in the cycloreversion reaction at a temperature as low as -100 to -90°C, the lithium cation acting as a Lewis acid. The reaction of dimethoxycyclopropene complex 4 with zinc triflate unexpectedly resulted in the formation of methyl acrylate complex 13, which was characterized crystallographically.
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemistry(all)
- Organic Chemistry
- Chemistry(all)
- Inorganic Chemistry
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In: Organometallics, Vol. 19, No. 11, 28.04.2000, p. 2108-2113.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reactions of cyclopropenone derivatives with a cyclopentadienylcobalt(I) chelate
T2 - Formation of a cobaltacyclobutenone and a transformation of 2,2-dimethoxycyclopropenone to methyl acrylate at cobalt
AU - Foerstner, Jan
AU - Kakoschke, Alf
AU - Wartchow, Rudolf
AU - Butenschön, Holger
PY - 2000/4/28
Y1 - 2000/4/28
N2 - Reactions of cyclopropenone derivatives with the [2-(di-tert-butylphosphanyl)ethyl]cyclopentadienylcobalt(I) chelate system were investigated. Ethene complex 2 reacts with diphenylcyclopropenone under cobalt insertion to give cobaltacyclobutenone chelate complex 6 in 91% yield. 6 was characterized crystallographically and shows a structure similar to that of a known platinacyclobutenone. Thermoanalysis of 6 indicated a reaction at elevated temperature, which was shown to be a cycloreversion at 60°C leading to known diphenylethyne and carbonyl complexes 7 and 9. Attempts to reduce the metallacyclobutenone with lithium tetrahydridoaluminate resulted in the cycloreversion reaction at a temperature as low as -100 to -90°C, the lithium cation acting as a Lewis acid. The reaction of dimethoxycyclopropene complex 4 with zinc triflate unexpectedly resulted in the formation of methyl acrylate complex 13, which was characterized crystallographically.
AB - Reactions of cyclopropenone derivatives with the [2-(di-tert-butylphosphanyl)ethyl]cyclopentadienylcobalt(I) chelate system were investigated. Ethene complex 2 reacts with diphenylcyclopropenone under cobalt insertion to give cobaltacyclobutenone chelate complex 6 in 91% yield. 6 was characterized crystallographically and shows a structure similar to that of a known platinacyclobutenone. Thermoanalysis of 6 indicated a reaction at elevated temperature, which was shown to be a cycloreversion at 60°C leading to known diphenylethyne and carbonyl complexes 7 and 9. Attempts to reduce the metallacyclobutenone with lithium tetrahydridoaluminate resulted in the cycloreversion reaction at a temperature as low as -100 to -90°C, the lithium cation acting as a Lewis acid. The reaction of dimethoxycyclopropene complex 4 with zinc triflate unexpectedly resulted in the formation of methyl acrylate complex 13, which was characterized crystallographically.
UR - http://www.scopus.com/inward/record.url?scp=0001281596&partnerID=8YFLogxK
U2 - 10.1021/om0000818
DO - 10.1021/om0000818
M3 - Article
AN - SCOPUS:0001281596
VL - 19
SP - 2108
EP - 2113
JO - Organometallics
JF - Organometallics
SN - 0276-7333
IS - 11
ER -