TY - JOUR
T1 - Fulvenes and thermochromic ethylenes. Part LXXXIII. ‘Double dibenzotropones’ within C6-C7-C6-C7-C6 ring systems. Synthesis of bisbenzo[4,5]cyclohepta[1,2-a:2′,1′-d]benzene-5,7-dione and bisbenzo- [4,5]cyclohepta[1,2-a
T2 - 1′,2′d] benzene-5,13-dione
AU - Agranat, Israel
AU - Avnir, David
PY - 1974
Y1 - 1974
N2 - Condensation of pyromellitic anhydride with phenylacetic acid (2 mol. equiv.) gave the two isomeric di-γ-lactones of 4,6-bis-(a-hydroxystyryl)isophthalic acid (IX) and 2,5-bis-(a-hydroxystyryl)terephthalic acid (X) in the ratio of 5:3. 4,6-Bis-(2-phenylethyl)isophthalic acid (XI) and 2,5-bis-(2-phenylethyl)terephthalic acid (XIII), formed by reduction of (IX) and (X), respectively, have been cyclized and dehydrogenated to bisbenzo[4.5]- cyclohepta[1,2-a:2’.1’-d]benzene-5,7-dione (III) and bisbenzo[4.5]cyclohepta[1,2-a:1’.2’-d]benzene-5,1 3- dione (IV).
AB - Condensation of pyromellitic anhydride with phenylacetic acid (2 mol. equiv.) gave the two isomeric di-γ-lactones of 4,6-bis-(a-hydroxystyryl)isophthalic acid (IX) and 2,5-bis-(a-hydroxystyryl)terephthalic acid (X) in the ratio of 5:3. 4,6-Bis-(2-phenylethyl)isophthalic acid (XI) and 2,5-bis-(2-phenylethyl)terephthalic acid (XIII), formed by reduction of (IX) and (X), respectively, have been cyclized and dehydrogenated to bisbenzo[4.5]- cyclohepta[1,2-a:2’.1’-d]benzene-5,7-dione (III) and bisbenzo[4.5]cyclohepta[1,2-a:1’.2’-d]benzene-5,1 3- dione (IV).
UR - http://www.scopus.com/inward/record.url?scp=37049130244&partnerID=8YFLogxK
U2 - 10.1039/P19740001155
DO - 10.1039/P19740001155
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AN - SCOPUS:37049130244
SN - 1470-4358
SP - 1155
EP - 1161
JO - Journal of the Chemical Society, Perkin Transactions 1
JF - Journal of the Chemical Society, Perkin Transactions 1
ER -