Flourescence of 3-(4'-AminophenyI)-7-aminocoumarins
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چکیده
منابع مشابه
Intramolecular Povarov reactions involving 3-aminocoumarins.
A series of pentacyclic heterocyclic systems (15 examples, 69-89%) have been synthesized using intramolecular Povarov reactions involving 3-aminocoumarins and O-cinnamylsalicylaldehydes. The Povarov adducts are formed with high selectivity for the trans,trans relative stereochemistry in the newly-formed [6,6] fused ring system. One example of a Povarov adduct featuring a new [6,5] fused ring sy...
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New pyrimido [4, 5-e] [1, 3, 4]thia- diazin-7-yl] hydrazines were synthesized via the cyclocondensation of alkyl-2-phenylhydrazinecarbodithioates as a binucleophile with 5-bromo-2,4-dichloro-6-methylpyrimidine as a bielectrophile , and replacement of C-7 chloro atom by hydrazine in ethanol as the solvent . This method has advantages over methods currently described in the literature for the con...
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In the racemic title compound, C21H18O4, the chromone ring is essentially planar [maximum deviation from the least-squares plane = 0.026 (3) Å], with a dihedral angle of 78.18 (12)° between the benzene rings of the chromanone and chromenone moieties. In the crystal, there are weak π-π stacking inter-actions [minimum ring centroid separation = 3.9286 (17) Å].
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In the title compound, C(10)H(5)FO(3), the chromenone ring is essentially planar, with a maximum deviation of 0.039 (1) Å. The dihedral angle between the fluoro-subsituted benzene ring and the pyran ring is 1.92 (4)°. In the crystal, mol-ecules are connected via weak inter-molecular C-H⋯O hydrogen bonds, forming supra-molecular ribbons along the b axis. These ribbons are stacked down the a axis.
متن کاملLecture 2 - 3 : 4 / 7 / 2015
Where 1 is the vector of all ones, so J is the matrix of all ones. Lemma 2.1. det(L̃G) = n× number of spanning trees in G. Proof. Recall that for n×n matrices A and B, det(A+B) = ∑ S det([ASBS̄ ]) where S iterates over subsets of [n]. We apply this inequality on L̃G = LG + 1 nJ . If we take zero columns from J the determinant is zero. If we take two or more columns from J the determinant is also z...
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ژورنال
عنوان ژورنال: NIPPON KAGAKU KAISHI
سال: 1972
ISSN: 2185-0925,0369-4577
DOI: 10.1246/nikkashi.1972.644