C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 23/04 (2006.01) C07D 309/34 (2006.01) C07D 335/02 (2006.01) C07D 335/06 (2006.01) C07D 345/00 (2006.01) C09B 23/01 (2006.01) C09B 57/00 (2006.01) G03G 5/06 (2006.01) G11B 7/247 (2006.01)
Patent
CA 2067959
C-7660 SQUARYLIUM COMPOUNDS, AND PROCESSES AND INTERMEDIATES FOR THE SYNTHESIS OF THESE COMPOUNDS Abstract Squarylium compounds of the formula: Image (I) wherein Q1 and Q2 are each independently a pyrylium, thiopyrylium, selenopyrylium, benzpyrylium, benzthiopyrylium or benzselenopyrylium nucleus, and R1 and R2 are each independently an aliphatic or cycloaliphatic group, can be prepared by reacting a squaric acid derivative of the formula: Image (II) with a compound of the formula Q2CH2R2 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 Q1CH2R1 in the presence of a base to produce a compound of the formula: Image (III) wherein Q1 and R1 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 Q1CH2R1 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.
Garcia Paulina P.
Lee John W.
Mcgowan Donald A.
Spencer Thomas K.
Telfer Stephen J.
Polaroid Corporation
Smart & Biggar
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