Sandalwood-type fragrance compounds

A compound of general Formula (I):

• wherein
• R1 represents H, an alkyl or an alkenyl group,
• R2 represents an alkyl or an alkenyl group, and
• R3 represents H or an alkyl group;
• wherein at the position of the dotted lines there is optionally a C═C double bond or a cyclopropane ring;
• and
• wherein the butyl chain C1 to C4 is either saturated or is unsaturated and contains one double bond in position C2/C3 or C3/C4;
• wherein the compound comprises either
• at least one cyclopropane substituent attached to the butyl chain in position C2 or C4;
• or
• at least one alkenyl group attached to the butyl chain in position C2 or C4, wherein if the alkenyl group is attached to the butyl chain in position C4, the butyl chain comprises a C═C double bond in position C2/C3 or a further alkenyl group in position C2;
• or at least one stereoisomer of the compound of general Formula (I);
• or
• a compound of general Formula (VI):
• wherein
• R1 represents H, an alkyl or an alkenyl group,
• R2 represents H or an alkyl, and
• R3 represents H or an alkyl group;
• wherein at the position of the dotted lines there is optionally a C═C double bond or a cyclopropane ring;
• and
• wherein the butyl chain C1 to C4 is either saturated or is unsaturated and contains one double bond in position C2/C3 or C3/C4;
• wherein the compound comprises either
• at least one cyclopropane substituent attached to the butyl chain in position C2 or C4;
• or
• at least one alkenyl group attached to the butyl chain in position C2 or C4, wherein if the alkenyl group is attached to the butyl chain in position C4, the butyl chain comprises a C═C double bond in position C2/C3 or wherein if the alkenyl group is attached to the butyl chain in position C2, the butyl chain comprises a C═C double bond in position C3/C4;
• or
• an alkyl group attached to the butyl chain in position C2 and C4, wherein the butyl chain comprises a C═C double bond in position C2/C3;
• or at least one stereoisomer of the compound of general Formula IV.