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provides coniferyl ferulate(CAS#:50743-32-3) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Articles of coniferyl ferulate are included as well.>> amp version: coniferyl ferulate
Pristimantis is the most diverse genus of tetrapods comprising 532 described species. It contains a large number of morphologically cryptic species that are being discovered with the assistance of genetic evidence. We use molecular, morphological, bioacoustic, and environmental data to assess the phylogenetic relationships and determine the species within an Andean clade of Pristimantis, which is distributed from central Ecuador to northern Peru. We assign to this clade the name Huicundomantis and propose it as a subgenus. Our results show that Huicundomantis is composed of two large clades which we name as the P. phoxocephalus species group and the P. cryptomelas species group. Huicundomantis is composed of 28 species of which 12 have been described and 16 are new. We describe 11 of these undescribed species. The most effective characters to discriminate among species are DNA sequences, qualitative morphology, and advertisement calls. Morphometric and environmental characters are not very useful to define species limits. We clarify the identity of P. riveti and show that populations from southern Ecuador traditionally ascribed to P. riveti are a new species, P. lutzaesp. nov. We also show that P. prometeii is a junior synonym of P. hampatusami. The current diversity and geographic distribution of Huicundomantis are consistent with a model of allopatric speciation. All species have a restricted distribution range (less than 4330 km2) and are assigned to the Red List categories Data Deficient or threatened with extinction. We provide new reasons to increase conservation efforts for these species and their habitat. Taking our results into account, Pristimantis species richness in Ecuador increases from 211 to 221 species, and the number of species endemic to Ecuador from 119 to 129.
Andes, cryptic diversity, integrative taxonomy, Neotropics, Pristimantis phoxocephalus species group, P. cryptomelas species group
Systematics of Huicundomantis, a new subgenus of Pristimantis (Anura, Strabomantidae) with extraordinary cryptic diversity and eleven new species
Nadia B. Paez1,2 and Santiago R. Roncorresponding author1
The synthesis, crystal structure and structural motif of two thiophene-based cyanoacrylate derivatives, namely, ethyl (E)-2-cyano-3-(3-methylthiophen-2-yl)acrylate (1), C11H11NO2S, and ethyl (E)-2-cyano-3-(thiophen-2-yl)acrylate (2), C10H9NO2S, are reported. Derivative 1 crystallized with two independent molecules in the asymmetric unit, and derivative 2 represents a new monoclinic (C2/m) polymorph. The molecular conformations of 1 and the two polymorphs of 2 are very similar, as all non-H atoms are planar except for the methyl of the ethyl groups. The intermolecular interactions and crystal packing of 1 and 2 are described and compared with that of the reported monoclinic (C2/m) polymorph of derivative 2 [Castro Agudelo et al. (2017 ▸). Acta Cryst. E73, 1287-1289].
crystal structure, thiophene-based cyanoacrylates, polymorph, crystal supramolecularity
Synthesis, characterization, crystal structure and supramolecularity of ethyl (E)-2-cyano-3-(3-methylthiophen-2-yl)acrylate and a new polymorph of ethyl (E)-2-cyano-3-(thiophen-2-yl)acrylate
Mahmoud Al-Refai,a Basem F. Ali,a,* Ala’a B. Said,a Armin Geyer,b Michael Marsch,b and Klaus Harmsb
2019 Sep 1;
In the title hydrated salt, C6H7N2O2 +·C7H5O6S−·H2O, the benzene ring of the cation makes a dihedral angle of 1.32 (19)° with the attached nitro group. In the anion, an intramolecular O—H⋯O hydrogen bond with an S(6) ring motif is formed between the carboxyl and hydroxy groups; the dihedral angle between the carboxyl group and the benzene ring is 8.76 (8)°. The crystal structure exhibits intermolecular N—H⋯O, O—H⋯O, C—H⋯O, and π-π [centroid-centroid distances = 3.6634 (9) and 3.7426 (9) a] interactions to form a three-dimensional network.
4-Nitroanilinium 3-carboxy-4-hydroxybenzenesulfonate monohydrate
P. K. Sivakumar,a M. Krishna Kumar,b G. Chakkaravarthi,c,* R. Mohan Kumar,b and R. Kanagaduraib,*
2013 Nov 1