C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/616.3, 260/6
C07C 39/12 (2006.01) C07C 37/11 (2006.01) C07C 37/20 (2006.01)
Patent
CA 1109894
ABSTRACT OF THE DISCLOSURE A method for preparing sterically hindered bis- or poly- phenols of the formula: R" - CH - R"' R' wherein R' is hydrogen, a C1-C4 alkyl, R" and R"' the same or different and are each: or Image Image Image wherein R is a tertiary C4-C8 alkyl, R1 and R2 are the same or different and represent a C1-C8 alkyl or a C6-C8 cycloalkyl, or a C7-C9 aralkyl, which comprises reacting the starting sterically hindered 2,4,6-trialkylphenols of the formula: Image wherein A is a C1-C8 alkyl or a C6-C8 cycloalkyl or a C7-C9 aralkyl or a 3,5-dialkyl-2-hydroxybenzyl of the formula: Image B is a C1-C8 alkyl, or a C6-C8 cycloalkyl, or a C7-C9 aralkyl, or a 3,5-dialkyl-4-hydroxybenzyl of the formula: Image wherein R1 and R are as identified above, with acetals, aldehydes or donors of C1-C5 aldehydes in an acidic medium at a temperature within the range of from 60 to 200°C in the presence of an acidic catalyst, followed by isolation of the desired product. The method according to the present invention makes it possible to prepare sterically hindered bis- or polyphenols in a single stage, whereby the process technology is substantially simplified as compared to those of the prior art. The method of the present invention pre- cludes formation of waste waters and atmosphere pollutants. The method ensures preparation of the desired products possessing a high quality in a high yield without any additional crystallization.
280418
Gurvich Yakov A.
Gusev Vladimir K.
Kumok Simona T.
Liakumovich Alexandr G.
Michurov Jury I.
Nauchno-Issledovatelsky Institut Rezinovykh I. Latexnykh Izdely
Sterlitamaxky Opytno-Promyshlenny Neftekhimichesky Zavod
Swabey Ogilvy Renault
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