US PATENT SUBCLASS 435 / 52
.~ Preparing compound containing a cyclopentanohydrophenanthrene nucleus; nor-, homo-, or D-ring lactone derivatives thereof

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435 /   HD   CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY

41  DF  MICRO-ORGANISM, TISSUE CELL CULTURE OR ENZYME USING PROCESS TO SYNTHESIZE A DESIRED CHEMICAL COMPOUND OR COMPOSITION {26}
52.~ Preparing compound containing a cyclopentanohydrophenanthrene nucleus; nor-, homo-, or D-ring lactone derivatives thereof {4}
53  DF  .~.~> Containing heterocyclic ring
54  DF  .~.~> Acting on D-ring {2}
58  DF  .~.~> Hydroxylating {1}
61  DF  .~.~> Dehydrogenating; dehydroxylating {1}

DEFINITION

Classification: 435/52

Preparing compound containing a cyclopentanohydrophenanthrene nucleus; nor-, homo-, or D-ring lactone derivatives thereof:

(under subclass 41) Processes wherein the product synthesized contains a cyclopentanophenanthrene ring system, i.e., or the nor or homo or D-ring lactone derivatives. [figure]

(1) Note. The phenanthrene ring system contains more hydrogen than is present in phenanthrene.

(2) Note. Common atoms of two rings are considered to belong to the rightmost ring.

(3) Note. Homo derivatives wherein the D-ring is expanded to 6-carbons such as in Hellebrin are found here.