· Explanation: A doublet of doublets (dd) is a pattern of four lines of approximately equal intensity that results from coupling to two different protons. I can think of two situations in which I would expect to see dd splitting patterns: vinyl groups. 1,3,4-trisubstituted benzenes.
The all-band doublet is actually an antenna system and not just an antenna alone. Fig. 1 shows the basic elements of the system. The horizontal center-fed wire forms the antenna proper, which accounts for the radiation of transmitted energy and the reception of incoming energy. The parallel transmission line transfers the energy from the.
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· A doublet of doublets (dd) occurs when a hydrogen atom is coupled to two non- equivalent hydrogens. An example is the NMR spectrum of methyl acrylate. Each of the vinyl protons Ha,Hb and Hc is a dd. Let's examine the Hc signal at ppm. There are four separate peaks because Hc is coupled to both Ha and Hb, but with different coupling.
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