ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The [Co2 (CO)8]-catalyzed reaction between propyne and CO in acetone at 110° and 170 bar was re-investigated. There are five major products: (E)-3,4′-dimethyl-2,2′-bifurylidene-5,5′-dione (4), 3,5,8-trimethylcoumarin (8), 3a, 7a-dihydro-2,4,7,7a-tetramethyl-1H-inden-1-one (9), 2,6-dimethyl-5H-furo [3,2, -b]- pyran-5-one (11), and 2,7-dimethyl-5H-furo 3,2-b-pyran-5-one (12); of these, only one, 4. had previously been recognized. In parallel experiments were obtained 2,6-dipentyl-5 H-furo[3,2-b]pyran-5-one (13), 2,7-dipentyl-5H-furo[3,2-b]pyran-5-one (14), 3a, 7a-dihydro-2,4,7,7a-tetrapentyl-1H-inden-1-one (15). And 3a, 7a-dihydro-2,4,6,7a-tetrapentyl-1H-inden-1-one (16) from hept-1-yne, and two further types of products from two atypical 1-alkynes: 3,6,9-tri(tert-butyl)-1-oxaspiro[4.4]nona-3,6,8-trien-2-one (20) from (tert-butyl)acetylene and the exo-dimer 21 of 2,5-bis(trimethylsilyl)cyclopenta-2,4-dien-1-one (22) from (trimethylsilyl)acetylene. Compounds 11,12, and 20 were identified by X-ray analysis.
Zusätzliches Material:
1 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19890720423
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