Hept- prefix

The higher members, beginning with pentane, are named systematically with a numerical prefix (pent-, hex-, hept-, etc., to denote the number of carbon atoms) and with the ending -ane to classify the compound as a paraffin hydrocarbon, as in Table 3-1. To specify a continuous-chain hydrocarbon, the prefix n- (for normal) sometimes is used. However, in the absence of any qualifying prefix, the hydrocarbon is considered to be normal or unbranched and we shall not use this prefix henceforth. You should memorize the names up to C10H22. 

OH has seven C s and the prefix is hept-. Numbering begins at the end of the chain with OH therefore, -l-ol. The aromatic ring substituent has Cl at the 3 position counting from the point of attachment, and it is put in parentheses to show that the entire ring is attached to the chain at C6. Cl on the chain is at C5.) 1°. 

Latin word for a given number, but there are exceptions. A one-carbon unit has the prefix meth, two carbons are eth, three carbons are prop, four carbons are but, and five, six, seven, eight, nine, and ten carbons are derived from the Latin terms pent, hex, hept, oct, non, and dec, respectively. 

The bicyclo[2.2.1]heptane cage is commonly known as the norbornyl system. This obscure name comes from a natural product, borneol, which has the structure shown in Figure 21.30, and comes from the camphor tree, common in Borneo. The prefixes syn and anti locate the direction of the OH or OTs group with respect to the double bond, and nor means no methyl groups. Thus, 7-hydroxybicyclo[2.2.1]hept-2-ene is 7-hydroxynorborn-2-ene, or, because there is only one possible place for the double bond, 7-hydroxy-norbornene. 

The alkanes are a type of hydrocarbon in which the carbon atoms are connected only by single bonds. One of the most common uses of alkanes is as fuels. Methane, used in gas heaters and gas cooktops, is an alkane with one carbon atom. The alkanes ethane, propane, and butane contain two, three, and four carbon atoms, respectively, connected in a row or a continuous chain. As we can see, the names for alkanes end in ane. Such names are part of the lUPAC (International Union of Pure and Applied Chemistry) system used by chemists to name organic compounds. Alkanes with five or more carbon atoms in a chain are named using Greek prefixes pent (5), hex (6), hept (7), oct (8), non (9), and dec (10) (see Table 11.2). 

Alkanes with five or more carbon atoms in a chain are named using the prefixes pent (5), hex (6), hept (7), oct (8), non (9), and... 

The names of fhe alkanes are composed of two parts a word stem (or prefix) and fhe ending (or suffix) -ane indicating that the molecule is an alkane. The first four word stems in Table 3.7 reflect common names, while the rest indicate the number of carbon atoms in the alkane. Thus C5H12 is pentane and C7H16 is heptane (hept = 7). 

---