Trailing atom

For syntactic brevity, the trailing atoms of a logic algorithm are often summarized into an annotation to the disjunct of synthesized literals they are logically attached to. Such an annotation consists of a set of identifiers of positive examples. 

Note the redundancy between the L=[] atoms in the minimal case one of them is a synthesized atom, whereas the other one is a trailing atom introduced by expansion. 

Figure 2.44 (afi) Two different and isosteric orientations of triplets of trails planar chains of sPS as in structure of a-form (Figure 2.24). (c) Atoms of backbone are statistically distributed in six positions around threefold axis, whereas atoms of phenyl rings are in same positions as in... 

In addition, many oxyanion holes have been discovered in which water is one of the hydrogen bonding donors. These waters are clearly defined in the respective electron density maps. In some enzymes these waters are part of a trail of water molecules [80, 81]. When water is used as the hydrogen bond donor, very often the intermediate that is stabilized is not the tetrahedral intermediate but an enolate, which is derived by base-catalyzed deprotonation of the Ca-atom of the... 

Isomeric alkenes may be either constitutional isomers or stereoisomers. There is a sizable barrier to rotation about a carbon-carbon double bond, which corresponds to the energy required to break the tt component of the double bond. Stereoisomeric alkenes are configurationally stable under normal conditions. The configurations of stereoisomeric alkenes are described according to two notational systems. One system adds the prefix cis- to the name of the alkene when similar substituents are on the same side of the double bond and the prefix trails- when they are on opposite sides. The other ranks substituents according to a system of rules based on atomic number. The prefix Z is used for alkenes that have higher ranked substituents on the same side of the double bond the prefix E is used when higher ranked substituents are on opposite sides. 

Figure 17.1 Trails of ionization left by heavy charged particles (initial energy of 10 MeV/ nucleon) as they penetrate through a photographic plate (nuclear emulsion). The ions interact with the atomic electrons in the emulsion creating ion pairs to expose the emulsion and the hacks become visible after the Him is developed. Notice the straight-line tracks. (From Knoll, 2000.)...

Because the addition of bromine is stereospecifically trails or anti, one bromine atom adds to each face of the olefin and can go to either carbon. If traw.v-2-pcntcnc is used as the substrate, then only the 2R,3S and 2S,3R pair is produced (they are also enantiomers.). However, the pair from cw-2-pentene is diastereomeric with die pair from fraws-2-pentene. 

Oxidation of a A3-phosphorus atom of stable P-heterocycles is a general reaction, which leaves the basic ring structures intact in many cases. This includes the conversion of l,2-dihydro-lA3,2A3-diphosphete derivatives like lc, for example, to form l,2-dihydro-lAs,2A3-diphosphete 22. Oxidation agents used are elemental selenium or [(CH3)3Si]202 <1997CB1519>. Upon photolysis lc rearranges partly into its m-isomer Id. The mixture of isomers can be reconverted completely into the trails-isomer lc by heating <1997JOC7605>. 

The aziridination works for both aromatic and aliphatic olefins, including less active linear terminal olefins. Most reactions proceed in good yield at room temperature. The use of ci.v-stilbene at 0°C gives predominately cis aziridine product in about 90 10 cis trails ratio (Table 6.1). The conservation of cis structure suggests that a discrete silver nitrene intermediate is involved in the reaction path. Because of the unique disilver structure and unlikely formation of a silver(III) species, the authors suspect that a bridged nitrene intermediate between the two silver atoms may be responsible for this transformation in which each silver atom donates one electron to the nitrenoid. However, further research is necessary to prove this hypothesis and a fast radical reaction mechanism cannot be eliminated on the basis of current evidence. 

Geometric isomerism, found in compounds with double bonds where there is no free rotation of the attached atoms or groups of atoms about the bond. This gives rise to two isomers, denominated cis and trails for example for but-2-ene (C4Hg) the cis isomer has the methyl groups (-CH3) on the same side of the bond, while the trans form has them on opposite sides ... 

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