Spiroatoms can be the origin of chirality even when they lack the required four different substituents normally observed in chirality. [clarification needed], Spiro compounds present unique preparative challenges, whether each ring contributing to its structure is unique or identical, or whether they are carbocyclic or heterocyclic—owing to the practical implications of tetra-functionalizing the central spiro atom (often with four different groups), and of the unique aspects of chirality that apply to these compounds. A common case is the presence of two atoms that are not carbon in one of the rings, with those two rings both attached to the spiro atom; indeed, often the earliest exposure of a chemist in training to a spiro compound is to a heterocyclic form, the ketal (acetal) formed in the protection of ketones by diols and dithiols. Two rings which are ortho-fused together have only two atoms and one bond in common. merge definition: 1. to combine or join together, or to cause things to do this: 2. to join a line of moving traffic…. Three may in like manner collide and fuse into a single ring. Join our early testers! Spiro compounds have at least two molecular rings with only one common atom. This latter reduction is accomplished using lithium aluminum hydride (LiAlH4), via the alcohol tosylate (formed using tosyl chloride). Once again, the best-fit planes to each ring are generally non-coplanar to one another (i.e., the rings are not coplanar, despite appearing so in images). 10 Types Of Nouns Used In The English Language, The Most Epic Words You’re Probably Neglecting. Spiranes can be chiral, in three distinct ways.

Vard, who had taken out a cigarette, held the tip tranquilly to his fuse. Telugu Meaning of Compound or Meaning of Compound in Telugu. But they were detached fires, and they did not fuse into a general mass at any time. Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group. [citation needed]. [citation needed], Bicyclic ring structures in organic chemistry that have two fully carbocyclic (all carbon) rings connected through just one atom are present both in natural products,[7] as well as in esoteric targets of chemical synthesis. Benzo [b] furan Benzo [b] pyridine Benzo [c] thiophene a … A spiro compound, or spirane, from the Latin spīra, meaning a twist or coil,: 1138 is a chemical compound, typically an organic compound, that presents a twisted structure of two or more rings (a ring system), in which 2 or 3 rings are linked together by one common atom,: SP … Initially, one of the carbinol moieties is protonated, allowing water to leave, and yielding the corresponding carbocation (second structure, first row); this intermediate then undergoes a bond migration, resulting in ring expansion of the adjacent ring, with deprotionation unmasking the ketone functional group to complete the first line of the mechanism. [6]:1138ff,1119ff [4]:319f.846f Hence, in the third case, the lack of planarity described above gives rise to what is termed axial chirality in otherwise identical isomeric pair of spiro compounds, because they differ only in the right- versus left-handed "twist" of structurally identical rings (as seen in allenes, sterically hindered biaryls, and alkylidenecycloalkanes as well). [10] Spiro compounds are named with the infix spiro followed by square brackets containing the number of atoms in the smaller ring, then the number of atoms in the larger ring, separated by a period, in each case excluding the spiroatom (the atom by which the two rings are bonded) itself. Figure 55 shows the fuse plug in the position for charging a 6-volt battery. When two rings are identical the priority is determined by a slight modification of the CIP system assigning a higher priority to one ring extension and a lower priority to an extension in the other ring. Cases include the presence of a spiro heteroatom such silicon and nitrogen (but also other Group IVA [14] and other atom types) connecting the rings that have been observed or are under theoretical study;[6]:1139f[citation needed] moreover, there are also many cases where one or more heteroatoms appear in one or more of the rings that are joined at a carbon spiro atom (e.g., where 1 oxygen spironolactones and 2 oxygen/2 sulfur ketals/thioketals are very common). cit., speaking to basic definitions in ancient use, and provides the vowel marking and definitions of coil, fold, twist, or spiral. This afternoon, unknown to Saranoff, I tampered with that radite can and removed the fuse.
If a pin is put through a lamp cord, a fuse is likely to blow out. Dravidian languages - Dravidian languages - Grammatical features and changes: The major grammatical categories are nouns and verbs. Hence this three reaction sequence provides three spiro compounds (ketone, alcohol, and alkane), of possible research or practical use.

Eliel, et al., op. Telugu definition, a Dravidian language spoken mainly in Andhra Pradesh state, SE India. Another word for fuse. After that he lighted the fuse, and, clambering down the slope of rock, saw Gordon.

[6]:1138ff First, while nevertheless appearing to be twisted, they yet may have a chiral center making them analogous to any simple chiral compound, and second, while again appearing twisted, the specific location of substiuents, as with alkylidenecycloalkanes, may make a spiro compound display central chirality (rather than axial chirality resulting from the twist); third, the substiuents of the rings of the spiro compound may be such that the only reason they are chiral arises solely from the twist of their rings, e.g., in the simplest bicyclic case, where two structurally identical rings are attached via their spiro atom, resulting in a twisted presentation of the two rings. Kitkatwords.com, Copyright © 2020. [citation needed] In both cases, the presence of the spiro center, often with four distinct groups attached, and with its unique aspects of chirality, adds unique challenges to the chemical synthesis of each compound type. This can be stated another way, saying that the best-fit planes to each ring are often perpendicular or are otherwise non-coplanar to one another. me, telugu meaning of compound, compound meaning dictionary. Alkaloids have diverse and important physiological effects on humans and other animals. Fused silica has 2 meanings: previously fused silica and presently fused silica. Again, while the rings could be identical, in the heterocyclic case they are, again, almost always non-identical. Find more ways to say fuse, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. A spiro compound, or spirane, from the Latin spīra, meaning a twist or coil,[12][6]:1138 [13] is a chemical compound, typically an organic compound, that presents a twisted structure of two or more rings (a ring system), in which 2 or 3 rings are linked together by one common atom,[3]:SP-0 examples of which are shown at right. The structural relationship of rings in a polycyclic compound can vary. Although sketches of organic structures makes spiro compounds appear planar, they are not; for instance, a spiro compound with a pair of three-membered cyclopropene rings connected in spiro fashion (image below) has been given the popular misnomer of being a bow tie structure, when it is not flat or planar like a bow tie. [4]:985[verification needed], Spiro forms of lactones and oxazines are frequently used as leuco dyes, frequently displaying chromism—reversible structural change between forms giving rise to colorless and colored appearances, especially in solution.

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