The present invention provides an indene composition having a content of indene of 80 to 99.5% by mass, in which a content ratio of a hydrocarbon compound having a condensed ring structure of a 5-membered ring and a 6-membered ring, and having 9 or 10 carbon atoms, in a component contained in addition to indene, is 90% by mass or more, and a content of benzonitrile is 0.5% by mass or less, and a content of sulfur is 5 ppm by mass or less.

An organic compound that emits red light having a long wavelength is represented by formula (1). In formula (1), R.sub.1 to R.sub.24 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted aryloxy group, a silyl group, and a cyano group. ##STR00001##

A complex of formula (I) ##STR00001## wherein M is zirconium or hafnium; each X independently is a sigma ligand; L is a divalent bridge selected from —R′.sub.2C—, —R′.sub.2C—CR′.sub.2—, —R′.sub.2Si—, —R′.sub.2Si—SiR′.sub.2—, —R′.sub.2Ge—, wherein each R′ is independently a hydrogen atom or a C.sub.1-C.sub.20-hydrocarbyl .group optionally containing one or more silicon atoms or heteroatoms of Group 14-16 of the periodic table or fluorine atoms, and optionally two R′ groups taken together can form a ring; R.sup.2 and R.sup.2′ are each independently a C.sub.1-C.sub.20 hydrocarbyl group, —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; R.sup.5 is a —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group, said R.sup.5 group being optionally substituted by one or more halo groups; R.sup.5′ is hydrogen or a C.sub.1-20 hydrocarbyl group; —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; said C.sub.1-20 hydrocarbyl group being optionally substituted by one or more halo groups; R.sup.6 and R.sup.6′ are each independently a C.sub.1-20 hydrocarbyl group; —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; each R.sup.1 and R.sup.1′ are independently —CH.sub.2R.sup.x wherein R.sup.x are each independently H, or a C.sub.1-20 hydrocarbyl group, optionally containing heteroatoms.

A complex of formula (I) ##STR00001## wherein M is zirconium or hafnium; each X independently is a sigma ligand; L is a divalent bridge selected from —R′.sub.2C—, —R′.sub.2C—CR′.sub.2—, —R′.sub.2Si—, —R′.sub.2Si—SiR′.sub.2—, —R′.sub.2Ge—, wherein each R′ is independently a hydrogen atom or a C.sub.1-C.sub.20-hydrocarbyl .group optionally containing one or more silicon atoms or heteroatoms of Group 14-16 of the periodic table or fluorine atoms, and optionally two R′ groups taken together can form a ring; R.sup.2 and R.sup.2′ are each independently a C.sub.1-C.sub.20 hydrocarbyl group, —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; R.sup.5 is a —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group, said R.sup.5 group being optionally substituted by one or more halo groups; R.sup.5′ is hydrogen or a C.sub.1-20 hydrocarbyl group; —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; said C.sub.1-20 hydrocarbyl group being optionally substituted by one or more halo groups; R.sup.6 and R.sup.6′ are each independently a C.sub.1-20 hydrocarbyl group; —OC.sub.1-20 hydrocarbyl group or —SC.sub.1-20 hydrocarbyl group; each R.sup.1 and R.sup.1′ are independently —CH.sub.2R.sup.x wherein R.sup.x are each independently H, or a C.sub.1-20 hydrocarbyl group, optionally containing heteroatoms.

The present disclosure relates to a multi- or dual-headed composition having the formula (I) or (II). The present disclosure also relates to a process for preparing the multi- or dual-headed composition having the formula (I) or (II), the process including combining 1,2,4-trivinylcyclochexane, an organometallic compound, and a catalyst precursor. The present disclosure further relates to use of the composition having the formula (I) or (II) in olefin polymerization.

The present disclosure relates to a multi- or dual-headed composition having the formula (I) or (II). The present disclosure also relates to a process for preparing the multi- or dual-headed composition having the formula (I) or (II), the process including combining 1,2,4-trivinylcyclochexane, an organometallic compound, and a catalyst precursor. The present disclosure further relates to use of the composition having the formula (I) or (II) in olefin polymerization.

Methods of preparing unsaturated compounds or analogs through dehydrogenation of corresponding saturated compounds and/or hydrogenation of aromatic compounds are disclosed.

Methods of preparing unsaturated compounds or analogs through dehydrogenation of corresponding saturated compounds and/or hydrogenation of aromatic compounds are disclosed.

The present invention provides an indene composition having a content of indene of 80 to 99.5% by mass, in which a content ratio of a hydrocarbon compound having a condensed ring structure of a 5-membered ring and a 6-membered ring, and having 9 or 10 carbon atoms, in a component contained in addition to indene, is 90% by mass or more, and a content of benzonitrile is 0.5% by mass or less, and a content of sulfur is 5 ppm by mass or less.

The present invention provides an indene composition having a content of indene of 80 to 99.5% by mass, in which a content ratio of a hydrocarbon compound having a condensed ring structure of a 5-membered ring and a 6-membered ring, and having 9 or 10 carbon atoms, in a component contained in addition to indene, is 90% by mass or more, and a content of benzonitrile is 0.5% by mass or less, and a content of sulfur is 5 ppm by mass or less.