prov:value
| - ed chains that contain from 1 up to about 10 carbon atoms, and the aryl portions contain from about 4 to about 14 carbons, except the R.sup.2 is not halide or pseudohalide; or,(ii) R.sup.1 and R.sup.2 together form --(CH.sub.2).sub.n, where n is 3 to 6; or,(iii) R.sup.1 and R.sup.2 together form 1,3-butadienyl; and R.sup.3, R.sup.4, R.sup.5, R.sup.6, and R.sup.7 are selected from (i), (ii), (iii)
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