Abstract: This disclosure relates, inter alia, to stimulants of pollen tube germination and growth of pollen tubes, and methods of their use to stimulate in vitro and in vivo pollen germination and pollen tube growth.

Abstract: This disclosure relates, inter alia, to stimulants of pollen tube germination and growth of pollen tubes, and methods of their use to stimulate in vitro and in vivo pollen germination and pollen tube growth.

Abstract: Optically active or racemic compounds represented by the formula ##STR1## where R.sub.1 is C.sub.1 to C.sub.4 straight chain or branched alkyl; R.sub.2 is selected from the group consisting of H, --OR.sub.1, --SR.sub.1, --NH(R.sub.1), --N(R.sub.4)(R.sub.5), aminocarbonyl, halogen, and --CN, where R.sub.4 and R.sub.5 are independently C.sub.1 to C.sub.6 straight chain or branched alkyl, or taken together form a 3- to 7-membered heterocycloalkyl substituent, such heteroatom selected from the group consisting of oxygen, nitrogen and sulfur, optionally including an additional heteroatom which is selected from the group consisting of nitrogen, oxygen, and sulfur; R.sub.3 is cyclopentyl or: ##STR2## where R' and R" are independently H, .dbd.O, --OH, or --NH.sub.2, with the proviso that R' and R" can be taken together form the following structure as R.sub.3 : ##STR3## where R'" is --OH or --NH.sub.2 ; and with the further proviso that when R.sub.3 is cyclopentyl or norbornyl, then R.sub.

Abstract: A method of preparing a 2'-fluoro compound of the formula ##STR1## where B is selected from the group consisting of purines and pyrimidines, both of which may be substituted, comprises reacting a compound of the formula II(a) or II(b) ##STR2## where R and R' are as defined in the specification with an acid halide under conditions effective to obtain a halide of the formula ##STR3## where X is a halogen. A silane of the formula B-Si (R").sub.3 where R" is as defined in the specification, is added to this product (III) under conditions effective to obtain a compound of the formula (IV) ##STR4## The compound of formula (IV) is reacted with a reagent selected from the group consisting of ammonia, BCl.sub.3 and ((C.sub.1 -C.sub.10)alkyl).sub.4 NF, under conditions effective to obtain the compound of formula (I). The compounds of formula (I) resulting from these methods exhibit anti-HIV activities and are useful for therapy against the HIV virus.

Abstract: Optically active or racemic compounds represented by the formula ##STR1## where R.sub.1 is C.sub.1 to C.sub.4 straight chain or branched alkyl; R.sub.2 is selected from the group consisting of H, --OR.sub.1, --SR.sub.1, --NH(R.sub.1), --N(R.sub.4)(R.sub.5), aminocarbonyl, halogen, and --CN, where R.sub.4 and R.sub.5 are independently C.sub.1 to C.sub.6 straight chain or branched alkyl, or taken together form a 3- to 7-membered heterocycloalkyl substituent, such heteroatom selected from the group consisting of oxygen, nitrogen and sulfur, optionally including an additional heteroatom which is selected from the group consisting of nitrogen, oxygen, and sulfur; R.sub.3 is cyclopentyl or: ##STR2## where R' and R" are independently H, .dbd.O, --OH, or --NH.sub.2, with the proviso that R' and R" can be taken together form the following structure as R.sub.3 : ##STR3## where R'" is --OH or --NH.sub.2 ; and with the further proviso that when R.sub.3 is cyclopentyl or norbornyl, then R.sub.

Abstract: A compound has the formula ##STR1## wherein R is selected from the group consisting of (C.sub.7 -C.sub.20)aroyl, (C.sub.6 -C.sub.20)aryl, aralkyl and alkylaryl, and (C.sub.1 -C.sub.10)alkyl-di(C.sub.6 -C.sub.20)aryl Si, R' is selected from the group consisting of (C.sub.1 -C.sub.10)alkyl, (C.sub.7 -C.sub.20)aroyl and (C.sub.2 -C.sub.12)acyl, all of which may be further substituted with O, S, N or alkyl, and R'" is selected from the group consisting of halogen, (C.sub.1 -C.sub.10)alkoxy, (C.sub.1 -C.sub.10)acyloxy, O-methane-sulfonyl and O-p-toluenesulfonyl. A composition of matter comprises 0.001 to 99.999 wt % of the above compound.