Methods to prepare .beta..beta.'-dihydroxy meso-substituted chlorins, isobacteriochlorins and bacteriochlorins
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United States of America Patent
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Nov 3, 1998
Issued Date -
N/A
app pub date -
May 8, 1997
filing date -
Oct 26, 1994
priority date (Note) -
Expired
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Abstract
A .beta.,.beta.'-dihydroxy meso-substituted chlorin, bacteriochlorin or isobacteriochlorin compound having the formula (I) or (II): ##STR1## wherein M is a metal. A novel method for synthesizing the compound of formula (I) or (II) comprises the steps of: a. osmylating a .beta...beta.'-unsubstituted, meso-substituted porphyrin to form an osmate ester at the .beta.,.beta.'-position, and b. reducing the osmate ester to form the corresponding .beta.,.beta.'-dihydroxy meso-substituted chlorin, bacteriochlorin or isobacteriochlorin of formula (I) or (II).
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