发明授权
US4447624A Preparation of thiophenes 失效
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Preparation of thiophenes
摘要:
Process for the preparation of thiophenes having the structure ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be various substituents. The compounds can be converted to the corresponding 2-amino compounds from which azo dyes can be prepared.
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