Stabilization of household, body-care and food products by using benzotropolone containing plant extracts and/or related benzotropolone derivatives

Compounds of formula

• wherein
• R′1, R′2 and R′7 independently from each other are hydrogen;
• C1-C30alkyl;
• or COR8;
• R′3 is hydrogen;
• or COOR9;
• R′4 is hydrogen;
• or C1-C30alkyl;
• R′5 is hydrogen;
• hydroxy;
• C1-C30-alkoxy;
• or —O—(CO)—R10;
• R′6 is hydrogen;
• C1-C30alkyl;
• or COR8;
• or
• R′5 and R′6 together may form a five or six membered ring;
• or
• R′6 and R′7 together form a five or six membered ring;
• and
• R′8, R′9, R′10 independently of each other are C1-C30alkyl;
• with the proviso that in the compounds of formula (1′) either R7 and R8 together form a five or six membered ring;
• or R6 and R7 together form a five or six membered ring.

Compounds of formula

• wherein
• R′2 and R′4 independently from each other are C1-C30alkyl;
• R′1, R′5, R′6 and R′7 are C1-C30alkyl;
• or COR8;
• and
• R′8 is defined as in formula (1′).

Compounds of formula

• wherein
• R′3 is a radical of formula
• R′20 is C3-C30alkyl;
• R′1, R′6 and R′7 are hydrogen;
• COR9;
• or C1-C30alkyl;
• and
• R′9 is C1-C30alkyl.

A method for protecting body-care and household products from photolytic and oxidative degradation by incorporating therein anyone of the compounds selected from the group consisting of formulae (1′), (2′), (3′), (4′) and (5′)

• wherein
• R′1, R′2 and independently from each other are hydrogen;
• C1-C30alkyl;
• or COR8;
• R′3 is hydrogen;
• or COOR9;
• R′4 is hydrogen;
• or C1-C30alkyl;
• R′5 is hydrogen;
• hydroxy;
• C1-C30-alkyl;
• or —O—(CO)—R10;
• R′6 is hydrogen;
• C1-C30alkyl;
• COR8;
• or
• R′5 and R′6 together may form a five or six membered ring;
• or
• R′6 and R′7 together form a five or six membered ring;
• and
• R′8, R′9, R′10 independently of each other are C1-C30alkyl;
• with the proviso that in the compounds of formula (1′) either R7 and R8 to ether form a five or six membered ring;
• or R6 and R7 together form a five or six membered ring;
• wherein
• R′21 and R′22 independently of one another are hydrogen;
• OH;
• C1-C30alkyl;
• or C1-C30alkoxy, and
• R′1, R′2, R′3, R′4 and R′7 are defined as in formula (1′);
• wherein
• R′21 and R′22 independently of one another are hydrogen;
• OH;
• C1-C30alkyl;
• or C1-C30alkoxy;
• and
• R′1, R′2, R′3, R′4 and R′5 are defined as in formula (1′);
• wherein
• R′2 and R′4 independently from each other are C1-C30alkyl;
• R′1, R′5, R′6 and R′7 are C1-C30alkyl;
• or COR8;
• and
• R′8 is defined as in formula (1′);
• and
• wherein
• R′3 is a radical of formula
• R′20 is C3-C30alkyl;
• R′1, R′6 and R′7 are hydrogen;
• COR9;
• or C1-C30alkyl;
• and
• R′9 is C1-C30alkyl.