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  2. Baker–Nathan effect - Wikipedia

    en.wikipedia.org/wiki/Baker–Nathan_effect

    In 1935 Baker and Nathan explained the observed difference in terms of a conjugation effect and in later years after the advent of hyperconjugation (1939) as its predecessor. A fundamental problem with the effect is that differences in the observed order are relatively small and therefore difficult to measure accurately.

  3. Spanish conjugation - Wikipedia

    en.wikipedia.org/wiki/Spanish_conjugation

    How is my Spanish: Spanish conjugation charts Spanish conjugation chart. Chart to conjugate in 7 different Spanish tenses. SpanishBoat: Verb conjugation worksheets in all Spanish tenses Printable and online exercises for teachers and students... Espagram: verb conjugator Spanish verb conjugator. Contains about a million verb forms.

  4. Hyperconjugation - Wikipedia

    en.wikipedia.org/wiki/Hyperconjugation

    Hyperconjugation can be used to rationalize a variety of chemical phenomena, including the anomeric effect, the gauche effect, the rotational barrier of ethane, the beta-silicon effect, the vibrational frequency of exocyclic carbonyl groups, and the relative stability of substituted carbocations and substituted carbon centred radicals, and the thermodynamic Zaitsev's rule for alkene stability.

  5. Spanish verbs - Wikipedia

    en.wikipedia.org/wiki/Spanish_verbs

    Spanish is a relatively synthetic language with a moderate to high degree of inflection, which shows up mostly in Spanish conjugation. As is typical of verbs in virtually all languages, Spanish verbs express an action or a state of being of a given subject, and like verbs in most Indo-European languages , Spanish verbs undergo inflection ...

  6. Spanish grammar - Wikipedia

    en.wikipedia.org/wiki/Spanish_grammar

    Every Spanish verb belongs to one of three form classes, characterized by the infinitive ending: -ar, -er, or -ir—sometimes called the first, second, and third conjugations, respectively. A Spanish verb has nine indicative tenses with more-or-less direct English equivalents: the present tense ('I walk'), the preterite ('I walked'), the ...

  7. Subjunctive mood in Spanish - Wikipedia

    en.wikipedia.org/wiki/Subjunctive_mood_in_Spanish

    Spanish also features the T–V distinction, the pronoun that the speaker uses to address the interlocutor – formally or informally [c] – leading to the increasing number of verb forms. Most verbs have regular conjugation, which can be known from their infinitive form, which may end in -ar, -er, or -ir. [11]

  8. Spanish irregular verbs - Wikipedia

    en.wikipedia.org/wiki/Spanish_irregular_verbs

    Spanish conjugation Spanish conjugator. 12,000 verbs conjugated. Diccionario panhispánico de dudas. Apéndice 1: Modelos de conjugación verbal. decimos.net A Spanish verb conjugator, partly based on this Wikipedia article, that explains each conjugated form step by step. List of all Spanish irregular verbs Complete list of over 270 Spanish ...

  9. Negative hyperconjugation - Wikipedia

    en.wikipedia.org/wiki/Negative_hyperconjugation

    Negative hyperconjugation is seldom observed, though it can be most commonly observed when the σ *-orbital is located on certain C–F or C–O bonds. [ 3 ] [ 4 ] In negative hyperconjugation, the electron density flows in the opposite direction (from a π- or p-orbital to an empty σ * -orbital) than it does in the more common ...

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