In the analysis of the molecular formula of organic molecules , the degree of unsaturation (DU) (also known as the index of hydrogen deficiency (IHD) , double bond equivalents (DBE) , or unsaturation index ) is a calculation that determines the total number of rings and π bonds . A formula is used in organic chemistry to help draw chemical structures. It does not give any information about those components individually—the specific number of rings, or of double bonds (one π bond each), or of triple bonds (two π bonds each). The final structure is verified with use of NMR , mass spectrometry and IR spectroscopy , as well as qualitative inspection. It is based on comparing the actual molecular formula to what would be a possible formula if the structure were saturated —having no rings and containing only σ bonds —with all atoms having their standard valence .
12-616: [REDACTED] Look up DBE in Wiktionary, the free dictionary. DBE may refer to: Science and technology [ edit ] dBe, decibels electrical, a unit of measure which measures the ratio of gain or attenuation of an electrical circuit Double bond equivalent , a term used in chemistry DBE (drug) , also known as estrobin, a synthetic estrogen Dibromoethane Dibasic ester , an organic chemical compound Double-balloon enteroscopy , an endoscopic technique for visualization of
24-519: A German encyclopedia Disadvantaged business enterprise , a term used in the United States to describe companies that are so certified by state governments Dominet Bank Ekstraliga , a Polish basketball league Dragonball Evolution , a 2009 film loosely based on the Dragon Ball manga Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
36-534: A Polish basketball league Dragonball Evolution , a 2009 film loosely based on the Dragon Ball manga Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title DBE . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=DBE&oldid=1007548393 " Category : Disambiguation pages Hidden categories: Short description
48-788: A file format extension used by the HP WindowsCE ActiveSync backup software Double Buffer Extension , an X Window System extension Other uses [ edit ] Dame Commander of the Most Excellent Order of the British Empire , a grade within the British order of chivalry D-Block Europe , a British hip-hop collective Department of Basic Education , in the South African Government Deutsche Biographische Enzyklopädie ,
60-418: A term used in chemistry DBE (drug) , also known as estrobin, a synthetic estrogen Dibromoethane Dibasic ester , an organic chemical compound Double-balloon enteroscopy , an endoscopic technique for visualization of the small bowel Design-basis event , the event which a nuclear facility is built to withstand DBE, database engineer, a new title for a Database administrator (DBA) .dbe ,
72-444: Is different from Wikidata All article disambiguation pages All disambiguation pages DBE [REDACTED] Look up DBE in Wiktionary, the free dictionary. DBE may refer to: Science and technology [ edit ] dBe, decibels electrical, a unit of measure which measures the ratio of gain or attenuation of an electrical circuit Double bond equivalent ,
84-556: Is the number of atoms with valence v i . That is, an atom that has a valence of x contributes a total of x − 2 to the degree of unsaturation. The result is then halved and increased by 1. For certain classes of molecules, the general formula can be simplified or rewritten more clearly. For example: where or where C = number of carbons, H = number of hydrogens, X = number of halogens and N = number of nitrogens, gives an equivalent result. In either case, oxygen and other divalent atoms do not contribute to
96-415: The British Empire , a grade within the British order of chivalry D-Block Europe , a British hip-hop collective Department of Basic Education , in the South African Government Deutsche Biographische Enzyklopädie , a German encyclopedia Disadvantaged business enterprise , a term used in the United States to describe companies that are so certified by state governments Dominet Bank Ekstraliga ,
108-463: The degree of unsaturation, as 2 − 2 = 0. For hydrocarbons, the DBE (or IHD) tells us the number of rings and/or extra bonds in a non-saturated structure, which equals the number of hydrogen pairs that are required to make the structure saturated, simply because joining two elements to form a ring or adding one extra bond (e.g., a single bond changed to a double bond) in a structure reduces
120-500: The need for two H's. For non-hydrocarbons, the elements in a pair can include any elements in the lithium family and the fluorine family in the periodic table, not necessarily all H's. A popular form of the formula is as follows: where C , N , H and X represent the number of carbon , nitrogen , hydrogen and halogen atoms, respectively. Each of the terms on the RHS can be explained, respectively, as follows: Adding an oxygen atom to
132-409: The small bowel Design-basis event , the event which a nuclear facility is built to withstand DBE, database engineer, a new title for a Database administrator (DBA) .dbe , a file format extension used by the HP WindowsCE ActiveSync backup software Double Buffer Extension , an X Window System extension Other uses [ edit ] Dame Commander of the Most Excellent Order of
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#1732859500551144-503: The title DBE . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=DBE&oldid=1007548393 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Double bond equivalent The formula for degree of unsaturation is: where n i
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