US PATENT SUBCLASS 549 / 369
.~.~.~.~.~ The ring oxygens are in the 1,3-positions of the hetero ring (e.g., 1,3 dioxane, etc.)

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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
356  DF  .~.~.~ The hetero ring is six-membered {9}
357  DF  .~.~.~.~ Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.) {4}
369.~.~.~.~.~ The ring oxygens are in the 1,3-positions of the hetero ring (e.g., 1,3 dioxane, etc.) {6}
370  DF  .~.~.~.~.~.~> Plural hetero rings
371  DF  .~.~.~.~.~.~> Nitrogen bonded directly to the hetero ring
372  DF  .~.~.~.~.~.~> Chalcogen or -C(=X), wherein X is chalcogen, bonded directly to the hetero ring
373  DF  .~.~.~.~.~.~> Nitrogen attached indirectly to the hetero ring by nonionic bonding
374  DF  .~.~.~.~.~.~> Chalcogen attached indirectly to the hetero ring by nonionic bonding {1}
376  DF  .~.~.~.~.~.~> Preparing by reacting an aldehyde with a compound containing acyclic carbon to carbon unsaturation

DEFINITION

Classification: 549/369

(under subclass 357) Compounds in which the hetero ring consists of two ring oxygens and four ring carbons wherein the ring oxygens are in the 1,3-positions of the hetero ring.

(1) Note. An example of a compound provided for herein is: [figure]