Dihydro nomenclature

Q -D-ido-Hexopyranoso[6,5,4-de][l,3]oxa2ine, 4,6-dideoxy-5, 6 -dihydro-nomenclature, 1, 31 3-Hexyne, 2,2,5,5-dimethyl-oxidation... 

Rhodacyanines possess two chromophoric systems. They are at the same time neutrocyanine derivatives, which involves position 5 of the ketomethylene, and methine cyanine, which involves position 2. Following lUPAC s standard nomenclature rules, structure 7 is named 3-ethyl-4-phenyl-2- 4-oxo-3-ethyl-5-[2-(3-ethy]-2,3-dihydro-benzo-l,3-thiazo-lylidene)ethylidene]-tetrahydro-l,3-thiazolylidene-methyl -1.3-thiazolium iodide (Scheme 5). It implies that the 4-phenyl thiazole ring having the... 

Dibenz[h,e]azepine-6,11-diones ent-Morphinan nomenclature, 1, 29 Morphinan, 1,2,3,4-tetrahydro-nomenclature, 1, 29 14-a-Morphinan, N-methyl-synthesis, 1, 480 Morphinans nomenclature, 1, 29 as pharmaceuticals, 1, 148 synthesis, 2, 377 Morphine, 2, 512 as analgesic, 1, 167 as metabolite of normorphine, 1, 235 as pharmaceutical, 1, 146, 147, 148 synthesis, 1, 480 Morphine alkaloids structure, 4, 534 Morphin-7-en nomenclature, 1, 29 Morphinone, dihydro-as pharmaceutical, 1, 147 Morpholine — see also 1,4-Oxazine, tetrahydrocarcinogenicity, 1, 229 corrosion inhibitor, 1, 409 metabolism, 1, 226 nomenclature, 3, 996 structure, 2, 5 synthesis, 2, 89 Morpholine, 4-aciyloyl-polymers, 1, 291 Morpholine, alkenyl-polymers, 1, 291... 

Quinolizinium iodide, 3,4-dihydro-dehydrogenation, 2, 547 Quinolizinium iodide, 2-methylthio-synthesis, 2, 544 Quinolizinium ions, 2, 525-578 aza analogues, 2, 525-578 charge transfer bands, 2, 527 MO calculations, 2, 527 nomenclature, 2, 526 structure, 2, 3 UV spectra, 2, 19, 526-527 Quinolizinium ions, hydroxydihydro-reactions, 2, 549... 

Chlorophyll a, the green photosynthesis pigment, is the prototype of the chlorin (2,3-dihydro-porphyrin) class of products. It was first isolated by Willstatter1 at the turn of the century. The common structural unit in this class is the chlorin framework named after chlorophyll. The chromophore with a partially saturated pyrrole ring, which is formally derived from the completely unsaturated porphyrin, is less symmetric than the latter and systematically named according to IUPAC nomenclature as 2,3-dihydroporphyrin. 

This chapter covers literature published since 1982 early materials are included here only where needed as a basis for describing further developments or where not previously mentioned in CHEC-1 <84CHEC-l(5)669>. The structural types surveyed here include 1,2,3-triazoles, benzotriazoles, their dihydro derivatives and carbocyclic fused compounds. Compounds with heterocyclic fused rings are not included. The nomenclature system was discussed in CHEC-T <84CHEC-I(5)670>. 

Dihydroxytriazinylformaldoxime, Dihydroxy-triazinylmethanol Oxime or 3,4-Dihydro-6-hydroxy-4-oxo-s-triazine-2-carboxaldehyde Oxime CA Nomenclature). 

Hydrogenation products of complex aromatic ring systems that are not treated as alicyclic hydrocarbons are named by prefixing dihydro, tetrahydro, etc., to the parent name. The lowest locants are used. Perhydro" is used in trivial nomenclature to indicate a fully hydrogenated compound. 

Vilsmeier reaction, 4, 1051 Furo[3,2-6]pyrroles MO calculations, 6, 979 synthesis, 4, 1069 6, 1009 Furo[3,4-a]pyrrolo[2,1,5-cd]indolizine nomenclature, 1, 22 Furopyrylium salts, 4, 993-995 Furoquinolines biosynthesis, 4, 992 occurrence, 4, 988 pharmacology, 4, 992 reactions, 4, 988 synthesis, 4, 989 Furo[3,2-c]quinolines, 4, 991 Furo[3,4-fe]quinoxaline, 1,3-diphenyl-synthesis, 4, 993 Furoquinoxalines, 4, 992 Furo[2,3-6]quinoxalines synthesis, 4, 992 Furosemide toxicity, 1, 136 Furospinulosin UV spectra, 4, 587 Furospongin-I mass spectrometry, 4, 583 Furo[3,4-d][l,2,3]triazole, 2,6-dihydro-synthesis, 6, 996 Furo[3,4 -d][ 1,2,3]triazoles synthesis, 6, 996 Furoxan, 4-amino-3-aryl-tautomerism, 6, 404 Furoxan, 4-amino-3-methyl-synthesis, 4, 414 Furoxan, 4-aryl-3-methyl-rearrangement, 6, 408 Furoxan, 3-aryl-4-nitro-synthesis, 6, 414 Furoxan, 4-benzoyl-3-methyl-oxime... 

The nomenclature for fused 5 5 systems is generally related to the two fused component heterocyclic rings as indicated above for imidazo[4,5-rf]imidazole (1), although compounds are sometimes named as hetero derivatives of pentalene. Heterocycles which are not fully conjugated can be named as dihydro, tetrahydro, etc., derivatives of the fully conjugated parent system or as hetero derivatives of the saturated parent hydrocarbon. For example heterocycle (6) can be named as a tetraaza bicyclo[3.3.0]octane. 

Reduction of one or two double bonds in the azole ring gives nonaromatic systems. Historically, these derivatives have been described as azolines and azolidines, as illustrated by the pyrazole derivatives 25 and 26. In 3-pyrazoline 25 the 3 indicates the first ring atom associated with the double bond . In the older literature the position of the double bond is indicated by An, where n is the number of the first ring atom associated with the double bond, e.g., A3-pyrazoline 25. Alternatively, they are named as dihydro or tetrahydro derivatives of the parent azole (e.g., 2,5-dihydropyrazole 25) and this nomenclature is IUPAC-preferred nomenclature for rings with more than two heteroatoms . 

The 4-keto-l,2,3,4-tetrahydroisoquinolines are more systematically called 2,3-dihydro-4(l.ff J-isoquinolones, but the keto nomenclature would seem to be more descriptive of their properties. 

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