| http://www.w3.org/ns/prov#value | - carbonic acid; Q is nitrogen or phosphorous; and L is a leaving group is selected from the group consisting of: ##STR20## wherein R5 and R6 are a C1 -C12 alkyl group, R7 is H or R5, and Y is selected from the group consisting of, --SO- 3 M+, --COO- M+, --SO- 4 M+, --N+ (R5)3 X-, NO2, OH, and O--N(R5)2 and mixtures thereof; M+ is a cation which provides solubility to the precursor, and X- is an an
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