The Basic Rules of naming for alkene

For straight chain alkenes, it is the same basic rules as nomenclature of alkanes except change the suffix to "-ene."

1. Find the Longest Carbon Chain that Contains the Carbon Carbon double bond. If you have two ties for longest Carbon chain, and both chains contain a Carbon Carbon double bond, then identify the most substituted chain.
2. Give the lowest possible number to the Carbon Carbon double bond.
   • Do not need to number cycloalkenes because it is understood that the double bond is in the one position.
   • Alkenes that have the same molecular formula but the location of the doble bonds are different means they are constitutional isomers.
   • Functional Groups with higher priority:
3. Add substituents and their position to the alkene as prefixes. Of course remember to give the lowest numbers possible. And remember to name them in alphabetical order when writting them.

In this diagram this is a cis conformation. It has both the substituents going upward. This molecule would be called (cis) 5-chloro-3-heptene.)

Trans would look like this

v. On the other hand if there are 3 or 4 non-hydrogen different atoms attached to the alkene then use the E, Z system.

E (entgegen) means the higher priority groups are opposite one another relative to the double bond.

Z (zusammen) means the higher priority groups are on the same side relative to the double bond.

(You could think of Z as Zame Zide to help memorize it.)

In this example it is E-4-chloro-3-heptene. It is E because the Chlorine and the CH₂CH₃ are the two higher priorities and they are on opposite sides.

vi. A hydroxyl group gets precedence over th double bond. Therefore alkenes containing alchol groups are called alkenols. And the prefix becomes --enol. And this means that now the alcohol gets lowest priority over the alkene.

vii. Lastly remember that alkene substituents are called alkenyl. Suffix --enyl.

Here is a chart containing the systemic name for the first twenty straight chain alkenes.

Did you notice how there is no methene? Because it is impossible for a Carbon to have a double bond with nothing.

اخر الاخبار

اخبار العتبة العباسية المقدسة

قسم الإعلام يعلن خطته الخاصة بخدمة البث المباشر في شهري المحرم وصفر

فرش حرم مرقد أبي الفضل العباس (عليه السلام) بأكثر من ألف متر مربع من السجاد الأحمر

خدمات دينية وثقافية يقدمها موكب أشبال الطف في شهر المحرم

قسم حفظ النظام يوضّح تفاصيل خطته الخاصة بالأيَّام العشرة الأولى من شهر المحرّم

المزيد

الآخبار الصحية

لمن تجاوز الستين.. عليك بشرب 4 أكواب من القهوة يوميا ؟

الحليب مع العسل.. مزيج يمنحك 7 فوائد صحية

لا تبالغ في التنظيف.. قليل من "الاتساخ" قد يحمي عائلتك

دراسة تكشف علاقة خطيرة بين عمر الأم وصحة مولودها

المزيد

الآخبار التكنلوجية

هل هاتفك مراقب؟.. 5 علامات خطيرة تكشف التجسس عليك

دبي تطلق أول رحلة تجريبية للتاكسي الجوي

كيف تساعد الصيانة الوقائية في الحفاظ على كفاءة التكييف في سيارتك ؟

في ظاهرة غريبة حيرت العلماء.. كوكبنا قد يسجل أقصر يوم في التاريخ هذا الصيف!

المزيد

مواضيع ذات صلة

Silicon and carbon compared

Sulfoxonium ylids

Sulfonium ylids

Sulfonium salts as electrophiles

Sulfonium salts

Thioacetals

A sulfoxide-stabilized anion in a synthesis

Sulfur-stabilized anions

Sulfur is a very versatile element

Symmetry in intramolecular crossed Claisen condensations

Intramolecular crossed Claisen ester condensations

Crossed Claisen ester condensations between two different esters