| 摘要 |
<p>A photochromic compound represented by formula (I):
<Chemistry id="chema01" num="0001"><Image id="ia01" he="27" wi="88" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein one of X<Sub>1</Sub> and X<Sub>2</Sub> represents a hydroxyl group, a sulfonic acid group or an alkali metal sulfonate base, and the other of X<Sub>1</Sub> and X<Sub>2</Sub> represents a hydrogen atom; X<Sub>3</Sub> and X<Sub>4</Sub> each represents a hydrogen atom, a lower alkyl group having from 1 to 3 carbon atoms, a lower alkoxy group having from 1 to 3 carbon atoms, a halogen atom, a nitro group or a cyano group; and R represents a straight chain alkyl group having from 1 to 30 carbon atoms. The compound exhibits excellent color developability.</p> |
