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n4google.
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:401557641
rdf:type
prov:Entity
prov:value
The compounds of this invention wherein R3 and R4 are other than hydrogen are prepared from the compounds wherein R3 and R4 are hydrogen by the following procedure: ##STR4## wherein R, R1, R2, R3 and R4 are as previously defined, and Hal is a halogen, particularly chloro or bromo.
prov:wasQuotedFrom
n4:com
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isap:221711938
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isa:401557641
Subject Item
isap:444542697
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isa:401557641