Disclosed are merocyanine derivatives of formula (1), wherein R1 and R2 independently from each other are branched C4-C22alkyl or branched C4-C12 alkenyl R3 and R4 independently from each other are cyano COR7, COOR7 CONR7R8 SO2(C6-C12)aryl C2-C12alk-1-enyl C3-C12cycloalk-1-enyl C2-C12alk-1-inyl C2-C12heteroalkyl C3-C5heterocycloalkyl C6-C10aryl or C1-C9heteroaryl wherein at least one of R3 and R4 is cyano R5 and R6 independently from each other are hydrogen C1-C6alkyl C5-C8cycloalkyl which may be substituted by one or more than one C1-C4alkyl and R7 and R8 independently from each other are hydrogen C1-C22alkyl C2-C12alkenyl C2-C12alkinyl C3-C12cycloalkyl C3-C12cycloalkenyl &mdash(CH2)tCOOH C7-C12aralkyl C1-C12heteroalkyl C2-C11heteroaralkyl C6-C10aryl C1-C9heteroaryl. The compounds are useful as UV absorbers for protecting human hair and skin against the damaging effect of UV radiation.본 발명은 하기 식(1)의 화합물에 관련된다.(1)상기 식에서, R1 및 R2는 각각 독립적으로 측쇄 C4-C22알킬 또는 측쇄 C4-C12알케닐이고R3 및 R4는 각각 독립적으로 시아노 COR7, COOR7 CONR7R8 SO2(C6-C12)아릴 C2-C12알크-1-에닐 C3-C12시클로알크-1-에닐 C2-C12알크-1-이닐 C2-C12헤테로알킬 C3-C5헤테로시클로알킬 C6-C10아릴 또는 C1-C9헤테로아릴 이때 적어도 하나의 R3 및 R4은 시아노이며R5 및 R6는 각각 독립적으로 수소 C1-C6알킬 하나 이상의 C1-C4알킬에 의해 치환될 수 있는 C5-C8시클로알킬이고 및R7 및 R8는 각각 독립적으로 수소 C1-C22알킬 C2-C12알케닐 C2-C12알키닐 C3-C12시클로알킬 C3-C12시클로알케닐 -(CH2)tCOOH C7-C12아랄킬 C1-C12헤테로알킬 C2-C11헤테로아랄킬 C6-C10아릴 C1-C9헤테로아릴이다.상기 화합물은 UV 조사의 해로운 효과에 대하여 인간 헤어 및 피부를 보호하기 위한 UV 흡수제로서 유용하다.
