The object of the present invention is a novel mandelate salt of a substituted tetracyclic tetrahydrofuran derivative according to Formula (I) ##STR00001## the N-oxide forms and the stereochemically isomeric forms thereof, wherein R.sup.1 and R.sup.2 each independently are hydrogen or C.sub.1-6alkyl and R.sup.3 and R.sup.4 each independently are hydrogen or halogen. In the foregoing definitions C.sub.1-6alkyl defines straight and branched saturated hydrocarbon radicals having from 1 to 6 carbon ...

The present invention provides a process for preparing benzoprostacycline derivatives of formula (1), i.e. 5,6,7-trinor-4,8-inter-m-phenylene PGI2 derivatives, and vinyl tin compounds of formula (III) as starting materials for the same.

In a process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over an acid catalyst in the presence of at least one telogen and/or comonomer, the telogen and/or comonomer is added at at least two addition points in different segments of the polymerization apparatus.

The invention relates to podophyllotoxins, uses thereof and methods of their production.

Catalytic compositions of oxides of titanium, vanadium and tin that are suitable for the production of phthalic anhydride by oxidizing o-xylene and/or naphthalene in the gas phase. The catalysts exhibit excellent activity and selectivity. The catalyst contains 2 to 15 percent by weight (calculated as V.sub.2O.sub.5) of vanadium, 1 to 15 percent weight (calculated as SnO.sub.2) of tin and 70 to 97 percent by weight (calculated as TiO.sub.2) of titanium. In a preferred embodiment the catalyst also...

The subject invention provides compounds having the structure: ##STR00001## wherein R.sub.1 is H, OH, a photoactivatable moiety, a fluorescent moiety, or a radioactive moiety; R.sub.2 is H, OH, a photoactivatable moiety, a fluorescent-moiety, or a radioactive moiety; R.sub.3 is H or OH; R.sub.4 is H, OH, a photoactivatable moiety, a fluorescent moiety, or a radioactive moiety; and wherein at least one of R.sub.1, R.sub.2, R.sub.3, or R.sub.4 is a photoactivatable moiety, a fluorescent moiety, or...

A pellicle which is excellent in transmittance and durability against short wavelength light, and which can be used for photolithography by using e.g. a KrF excimer laser, is provided.A pellicle for exposure to a light having a wavelength of at most 200 nm, which comprises a frame and a pellicle membrane bonded to the frame by means of an adhesive, wherein the pellicle membrane and/or the adhesive comprises a polymer containing repeating units represented by the following formula (1): ##STR00001...

A novel monomer compound having a lactone moiety of the present invention can be converted into polymers usable as resist materials with excellent properties, etc., and an alcohol compound having a lactone moiety of the invention is useful as a material for the monomer compound. The compounds are represented by the following general formula [1]: ##STR00001## wherein one of R.sup.1 and R.sup.2 represents a hydrogen atom, an acryloyl group, or a methacryloyl group, and the other represents an alky...

New bisbenzofuranes which are connected by a direct bond or a bridgemember being in conjugation with the double bonds of the furane nuclei are obtained by intra- or intermolecular condensation reactions. The products are useful as optical brighteners, especially for detergents.

The present invention is directed to adamantane compounds of the formulae: ##SPC1## ##SPC2## Wherein each G independently represents hydrogen or straight-chain alkyl of from 1 to 6, both inclusive, carbon atoms; G' represents hydrogen or acetyl; R represents hydrogen or alkyl of from 1 to 6, both inclusive, carbon atoms; R' represents halo, alkoxy containing from 1 to 6, both inclusive, carbon atoms in the alkyl group, hydrogen or alkyl of from 1 to 6, both inclusive, carbon atoms; each R" indep...