An organic electroluminescent element includes a light emitting layer including, as host materials, an anthracene-based compound represented by the following general formula (1) and a dibenzochrysene-based compound represented by the following general formula (2), and further including a dopant material.

##STR00001## (X and Ar.sup.4 in formula (1) each represent a hydrogen atom, an optionally substituted aryl, or the like, and R.sup.1 to R.sup.16 in formula (2) each represent a hydrogen atom, an aryl, or the like.)

The present invention is directed to methods for the preparation of eremophila-1(10)-11(13)-dien-12,8?-olide (EPD) and analogues thereof.

The present invention is directed to methods for the preparation of eremophila-1(10)-11(13)-dien-12,8?-olide (EPD) and analogues thereof.

The compound represented by formula (1): ##STR00001##
wherein A, B, R.sup.1, and R.sup.2 are as defined in the description,
provides organic electroluminescence (EL) devices having a high emission efficiency when operated at low voltage and a long lifetime and electronic devices including such organic EL devices.

The compound represented by formula (1): ##STR00001##
wherein A, B, R.sup.1, and R.sup.2 are as defined in the description,
provides organic electroluminescence (EL) devices having a high emission efficiency when operated at low voltage and a long lifetime and electronic devices including such organic EL devices.

The present disclosure relates to organic electroluminescent devices. The organic electroluminescent device according to the present disclosure exhibits improved lifespan characteristics and progressive driving voltage by including at least one deuterated compound(s).

An organic compound is represented by General Formula (G1) below. In General Formula (G1), X represents a sulfur atom or an oxygen atom, Ar.sup.2 represents a group represented by General Formula (G1-1) below, and Ar.sup.1 represents an aryl group having 6 to 30 carbon atoms or a heteroaryl group having 2 to 30 carbon atoms. At least one of R.sup.1 to R.sup.16 and R.sup.21 to R.sup.29 represents any of halogen, a nitrile group, an alkenyl group, a vinyl group, an alkynyl group, an ethynyl group, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 10 carbon atoms, an aryl group having 6 to 30 carbon atoms, and a heteroaryl group having 2 to 30 carbon atoms.

##STR00001##

Compounds of Formula I and the pharmaceutically acceptable salts thereof are disclosed ##STR00001## The variables X.sup.1, X.sup.2, and R.sup.1-4 are disclosed herein. The compounds are useful for treating cancer and related proliferative diseases. Pharmaceutical compositions containing compounds of Formula I and methods of treatment comprising administering compounds of Formula I are also disclosed.

Compounds of Formula I and the pharmaceutically acceptable salts thereof are disclosed ##STR00001## The variables X.sup.1, X.sup.2, and R.sup.1-4 are disclosed herein. The compounds are useful for treating cancer and related proliferative diseases. Pharmaceutical compositions containing compounds of Formula I and methods of treatment comprising administering compounds of Formula I are also disclosed.

A method of isolating and purifying ()-Ambrox from a reaction mixture comprising ()-Ambrox and one or more of the compounds (II), (III) and (IV) ##STR00001##