Formate ester indane compounds

A compound of the formula:

• ##STR6## wherein R.sup.1 is H, CH.sub.3, CH.sub.2 CH.sub.3, OCH.sub.3 or OH,
• R.sup.2 and R.sup.3 are, independently, H, CH.sub.3, CH.sub.2 CH.sub.3, OCH.sub.3, OH or OC(O)H,
• R.sup.4 and R.sup.7 are, independently, H, CH.sub.3, CH.sub.2 CH.sub.3 or CH(CH.sub.3).sub.2,
• R.sup.5 and R.sup.8 are, independently H or CH.sub.3, and
• R.sup.6 is H, CH.sub.3 or CH.sub.2 CH.sub.3,
• provided that
• (i) one of R.sup.2 and R.sup.3 is OC(O)H, and one of R.sup.2 and R.sup.3 is other than OC(O)H,
• (ii) when R.sup.1 is H, then R.sup.2 and R.sup.3 are other than OCH.sub.3 or OH,
• (iii) when R.sup.1 is other than H, then R.sup.7 is CH.sub.3 or CH.sub.2 CH.sub.3,
• (iv) no more than one of R.sup.4, R.sup.6 or R.sup.7 is CH.sub.2 CH.sub.3 or CH(CH.sub.3).sub.2,
• (v) no more than one of R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 is H,
• (vi) when each of R.sup.1, R.sup.3, R.sup.4 and R.sup.5 are CH.sub.3, then R.sup.8 is H,
• (vii) when R.sup.4 is CH(CH.sub.3).sub.2, then at least one of R.sup.5 or R.sup.6 is H,
• (viii) when R.sup.7 is CH(CH.sub.3).sub.2, then at least one of R.sup.6 or R.sup.8 is H,
• (ix) when R.sup.1 is OCH.sub.3, then R.sup.2 and R.sup.3 are other than OH, and
• (x) when R.sup.1 is OH, then R.sup.2 and R.sup.3 are other than OH or OCH.sub.3.