| 摘要 |
1,192,660. Stilbene derivatives. UPJOHN CO. 25 Sept., 1968 [17 Oct., 1967], No. 45523/68. Heading C2C. [Also in Divisions C3 and D1] The invention comprises stilbene derivatives of either of the formulµ in which R denotes an alkoxy group of 1-6 carbon atoms, X is 1-3, m is 1 or 2 and n is 0 or 1, the sum of m and n not exceeding 2. The invention extends to the cis and trans forms of the compounds, or mixtures thereof, but does not include 4.methoxy-4<SP>1</SP>-aminostilbene. The amines formulated above are prepared by reducing the corresponding nitro compounds with reducing agents which do not affect the ethylenic bond, some of which are specified. The isocyanates are obtained by phosgenating the amines. Examples are given. The products are useful in the manufacture of photoresist resins and light-sensitive polymers. The monoamines and monoisocyanates are useful also as optical brightening agents (see Divisions C3, D1 and G2). The nitro compounds used as starting materials are obtainable by condensing an aldehyde of the formula with a nitrotoluene of the formula or with a nitrophenylacetic acid of the formula In the second of these processes a cinnamic acid derivative of the formula is intermediately formed and may be isolated and subsequently decarboxylated by heating. Examples are given. |
