摘要 |
Novel benzoxazolyl benzene derivatives of formula (I): wherein R<SUP>1 </SUP>is hydrogen, C<SUB>1-20</SUB>-alkyl or C<SUB>2-20</SUB>-alkenyl; R<SUP>2 </SUP>and R<SUP>3 </SUP>are independently a group -C(R<SUP>4</SUP>,R<SUP>5</SUP>)C(R<SUP>6</SUP>)-C(R<SUP>7</SUP>,R<SUP>8</SUP>) (a) or a group -C(R<SUP>4'</SUP>,R<SUP>5'</SUP>)CH(R<SUP>6'</SUP>)CH(R<SUP>7'</SUP>,R<SUP>8'</SUP>) (b), wherein R<SUP>4</SUP>, R<SUP>5</SUP>, R<SUP>6</SUP>, R<SUP>7</SUP>, R<SUP>8</SUP>, R<SUP>4'</SUP>, R<SUP>5'</SUP>, R<SUP>6'</SUP>, R<SUP>7'</SUP> and R<SUP>8'</SUP> are independently, hydrogen, C<SUB>1-10</SUB>-alkyl or C<SUB>2-10</SUB>-alkenyl, or C<SUB>2-10</SUB>-alkyl or C<SUB>3-10</SUB>-alkenyl containing at least one oxygen atom interrupting the hydrocarbon chain; or wherein R<SUP>4</SUP>, R<SUP>5</SUP>, R<SUP>6</SUP>, R<SUP>4'</SUP>, R<SUP>5'</SUP> and R<SUP>6'</SUP> are hydrogen, C<SUB>1-10</SUB>-alkyl or C<SUB>2-10</SUB>-alkyl containing at least one oxygen atom interrupting the hydrocarbon chain, or alkyl substituted by silane or oligosiloxane moiety, and one of R<SUP>7 </SUP>and R<SUP>8 </SUP>or R<SUP>7'</SUP> and R<SUP>8'</SUP> is a silane or oligosiloxane moiety and the other one of R<SUP>7 </SUP>and R<SUP>8 </SUP>or R<SUP>7'</SUP> and R<SUP>8'</SUP> is hydrogen; and X is phenylene or naphthylene, or substituted phenylene or naphthylene for use as UV screening agents for protecting human skin or hair against radiation, and in UV screening compositions, particularly topical compositions for cosmentic or dermatological use.
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