ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Two push-pull-cyclobutadienes 10b and 10c are prepared by reaction of two eq. of the corresponding acetylenes having electrondonating and electronaccepting groups (4) with one eq. of HBF4 to cyclic cyanine salts, followed by elimination of HBF4 with KOC(CH3)3. These cyclobutadienes, stable in cristalline form at room temperature respectively for a short time (10b R=CH3) or for several days (10c R=OCH3), are extremely reactive in solution towards various nucleophiles and electrophiles. Cleavage of the nascent cyclobutenes leads to butadienes. The cyclobutadienes 10 dimerise thermally to cyclooctatetraenes 18.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19700530308
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