摘要 |
Squarylium compounds of the formula: <CHEM> wherein Q<1> and Q<2> are each independently a pyrylium, thiopyrylium, selenopyrylium, benzpyrylium, benzthiopyrylium or benzselenopyrylium nucleus, and R<1> and R<2> are each independently an aliphatic or cycloaliphatic group, can be prepared by reacting a squaric acid derivative of the formula: <CHEM> with a compound of the formula Q<2>CH2R<2> in the presence of a base. The derivatives of Formula II may be prepared by condensing a 2,3,4,4-tetrahalocyclobut-2-en-1-one with a compound of the formula Q<1>CH2R<1> in the presence of a base to produce a compound of the formula: <CHEM> wherein Q<1> and R<1> are as defined above, and X represents chlorine or bromine, and hydrolyzing the compound of Formula III. Alternatively, the derivatives of Formula II may be prepared by reacting a diester, monoacid chloride monoester or diacid chloride of squaric acid with a compound of the formula Q<1>CH2R<1> in the presence of a base, followed by hydrolysis of the resultant monoacid chloride or monoester derivative of the compound of Formula II to the parent compound. |
申请人 |
POLAROID CORP., CAMBRIDGE, MASS., US |
发明人 |
MCGOWAN, DONALD A., BEDFORD MA 01730, US;SPENCER, THOMAS K., LEXENA KS 66219, US;GARCIA, PAULINA P., ARLINGTON MA 02174, US;TELFER, STEPHEN J., ARLINGTON MA 02174, US;LEE, JOHN W., STILL RIVER MA 01467, US;ZURAW, MICHAEL J., ARLINGTON MA 02174, US |